ࡱ> [ bjbj Vjjl****FFF8FGjH|O(>O>O>OP[W_Y ?pcZPPcZcZi**>O>OoiiicZ*R>O>OicZiiofhp|"̋>OH P'? ?Fh؊D̋0h̋i**** SimulReflec Manual Frdric OTT Laboratoire Lon Brillouin CEA/CNRS, bat 563 CEA Saclay 91191 Gif sur Yvette Cedex FRANCE Tel: 01 69 08 61 21 Fax: 01 69 08 82 61 E-mail:  HYPERLINK "mailto:fott@cea.fr" fott@cea.fr Version 1.3  DATE \* MERGEFORMAT 19/06/2002 Content  TOC \o "1-3" 1 Nota  PAGEREF _Toc12286698 \h 4 2 General description  PAGEREF _Toc12286699 \h 4 3 Getting started  PAGEREF _Toc12286700 \h 4 3.1 At start-up  PAGEREF _Toc12286701 \h 4 3.2 First reflectivity calculation  PAGEREF _Toc12286702 \h 4 3.3 Introduction of the wavelength spectrum and wavelength distribution  PAGEREF _Toc12286703 \h 5 3.4 Polarised neutrons  PAGEREF _Toc12286704 \h 5 4 Description of the different elements of the program  PAGEREF _Toc12286705 \h 5 4.1 Description of the different panels  PAGEREF _Toc12286706 \h 5 4.1.1 Input/Output  PAGEREF _Toc12286707 \h 5 4.1.2 Experimental parameters  PAGEREF _Toc12286708 \h 6 4.1.3 Fitting  PAGEREF _Toc12286709 \h 6 4.1.4 Stability  PAGEREF _Toc12286710 \h 6 4.1.5 Multilayers  PAGEREF _Toc12286711 \h 6 4.1.6 Field  PAGEREF _Toc12286712 \h 6 4.1.7 X-rays  PAGEREF _Toc12286713 \h 6 4.1.8 Profiles  PAGEREF _Toc12286714 \h 6 4.1.9 Diffuse  PAGEREF _Toc12286715 \h 7 4.2 Description of the menus  PAGEREF _Toc12286716 \h 7 4.3 Model description  PAGEREF _Toc12286717 \h 8 4.3.1 Inserting a new layer  PAGEREF _Toc12286718 \h 9 4.4 Graphical window  PAGEREF _Toc12286719 \h 9 4.5 2D surfaces window  PAGEREF _Toc12286720 \h 9 5 File formats  PAGEREF _Toc12286721 \h 9 5.1 Data files  PAGEREF _Toc12286722 \h 9 5.2 Fit files  PAGEREF _Toc12286723 \h 10 5.3 Resolution files  PAGEREF _Toc12286724 \h 10 5.3.1 For wavelengths  PAGEREF _Toc12286725 \h 10 5.3.2 For the angular resolution  PAGEREF _Toc12286726 \h 10 6 Experimental resolution processing  PAGEREF _Toc12286727 \h 11 7 Super-Lattices (SL)  PAGEREF _Toc12286728 \h 11 7.1 How to describe it  PAGEREF _Toc12286729 \h 11 7.2 Taking into account the dispersion in the layers thicknesses  PAGEREF _Toc12286730 \h 11 7.3 Taking into account the dispersion in roughness  PAGEREF _Toc12286731 \h 12 8 FITTING  PAGEREF _Toc12286732 \h 12 8.1 The different fitting methods  PAGEREF _Toc12286733 \h 12 8.1.1 Simulated annealing  PAGEREF _Toc12286734 \h 12 8.1.2 Crawling  PAGEREF _Toc12286735 \h 12 8.1.3 Crawling random  PAGEREF _Toc12286736 \h 12 8.1.4 Gold search  PAGEREF _Toc12286737 \h 12 8.2 Data weighting for fits  PAGEREF _Toc12286738 \h 12 8.2.1 No weighting : (linear form)  PAGEREF _Toc12286739 \h 12 8.2.2 No weighting : (log form)  PAGEREF _Toc12286740 \h 13 8.2.3 Least square:  PAGEREF _Toc12286741 \h 13 8.2.4 Log form with least square type weighting  PAGEREF _Toc12286742 \h 13 8.3 Advice for fitting  PAGEREF _Toc12286743 \h 13 8.4 Stability  PAGEREF _Toc12286744 \h 13 8.5 Use of profiles  PAGEREF _Toc12286745 \h 14 9 Remarks on the high magnetic case measurements  PAGEREF _Toc12286746 \h 14 10 Diffuse signals simulation  PAGEREF _Toc12286747 \h 14 10.1.1 Normalisation  PAGEREF _Toc12286748 \h 15 11 Bug reporting  PAGEREF _Toc12286749 \h 15 12 Tips  PAGEREF _Toc12286750 \h 15 13 Parser  PAGEREF _Toc12286751 \h 15 13.1 The list of available functions is the following:  PAGEREF _Toc12286752 \h 15 13.2 Use of mathematical expressions  PAGEREF _Toc12286753 \h 16 14 To be done:  PAGEREF _Toc12286754 \h 17 15 References  PAGEREF _Toc12286755 \h 18 15.1 Specular reflectivity  PAGEREF _Toc12286756 \h 18 15.2 Diffuse scattering  PAGEREF _Toc12286757 \h 18 15.3 Surface diffraction  PAGEREF _Toc12286758 \h 19 16 Credits  PAGEREF _Toc12286759 \h 20 17 History  PAGEREF _Toc12286760 \h 21  Important notes : The term Qz refers to the scattering vector i.e. :  EMBED Equation.3  The fit file format has changed between version 1.2 and 1.3. In order to upgrade your fit files, you should refer to section XX. General description This program allows to simulate reflectivity curves and to fit experimental x-rays and neutron data. The incident waves can be either neutrons or p-polarised x-rays. The multi-layer system has to be described by a series of discrete layers which model as accurately as possible the physical system. The layers in this model can be characterised by their thickness, their density, their scattering diffusion length, their magnetisation, the direction of their magnetisation, their RMS roughness, the in-plane correlation length and a critical exponent describing the fractal dimension of the roughness. The program assumes that you have clean data : the background noise has to be subtracted, the polarisation corrections must have been done, the illumination correction are not performed by the program. It is not possible for the program to process your data for all the types of reflectometers. One exception is the absolute normalisation of the reflectivity which can be adjusted; however a proper normalisation is always a blessing. The program can take into account any lambda spectrum and angular divergence spectrum (but these data have to be explicitly provided). The calculation is performed using an exact recursive matrix calculation. In the case of polarised neutrons, the program can handle any magnetisation configuration (in or out of plane) and any applied magnetic field (in direction or magnitude). The Zeeman energy splitting effects are taken into account in the calculation. They can lead to large effects in the case of the spin-flip signals. Getting started The program interface consist of two windows. A graphical windows in which all your calculations are displayed (named graph2Dform) and an interface windows to input your requests and your multi-layer model (SimulReflecForm). This interface windows is divided in two parts. The bottom part consist of a Excel like table in which your can enter the description of your model for your multi-layer system. The top part is a series of panels which allows you to parameterise your problem. A third window can be displayed to plot 2D data. At start-up When you start the program a simple model is automatically created in the Excel sheet (called "Layers"). The first line should always contain the substrate description. In this case we have silicon. The second line contains a nickel layer of thickness 40 nm. The third line contains the incidence medium which in most case is the vacuum. It must always be described, no assumption is made about it. For each layer, the first column enables you to activate (using "Y") or deactivate (using "N") the layer in your model. This is useful when you want to fiddle with it. However, do not deactivate the incidence medium or the substrate (the results are not guaranteed). For each layer, there are a few essential parameters: (1) the thickness (in nm). You should never set it to zero since this is not equivalent to deactivating it (this does however not apply to the substrate and the incidence medium). (2) the atomic density (in 10^28 unit cells/m3) (9 in the case of the nickel layer), (3) the scattering length (in fm) (10.3 in the case of the nickel layer). First reflectivity calculation Select the [Calculation] menu and click on [Calculate Reflectivity]. The reflectivity of the nickel layer deposited on the silicon substrate is plotted in red lines. NOTA: all the calculations are plotted using continuous lines whereas the data are plotted using dots. Change the thickness of the nickel layer to 20 (in the same way as in Excel). Recalculate the reflectivity. The period of the oscillations is divided by two. Select the panel [Experimental parameter] and in the frame "Angles", change the max angle from 2 to 4. Recalculate the reflectivity (CTRL+R). In real experiments, it is rather easy to measure the reflectivity down to 10-5 for 1cm2 samples. Insertion of a new layer (DESCRIBE!!) Introduction of the wavelength spectrum and wavelength distribution In real experiments, the wavelength is not a Dirac. In the panel [Experimental Parameters], you can set the central wavelength (in our case, 0.43 nm). You can select a full wavelength spectrum by select the corresponding box. A wavelength spectrum is generated as a Gaussian with a FWHM you gave and the number of points you gave (3 to 5 points is usually plenty). Recalculate the reflectivity. Note that the oscillations are smoothed. NOTA : for purists you can enter the lambda spectrum as a two columns text file. Use then the [File][Open lambda spectrum] menu. The same process apply for the incident angular divergence. You can give the FWHM and the number of points for the theta distribution. A Gaussian distribution is then automatically generated. Recalculate the reflectivity. Note that the oscillations are smoothed further. NOTA : for purists you can enter the incident theta spectrum as a two columns text file. Use then the [File][Open theta spectrum] menu. You can check the effects of the different resolution by checking and unchecking the box "use full lambda/theta spectrum" and calculating the reflectivity. Typically, In the case of PRISM, Dq is usually set to 0.04. The Dl is 0.04. (CHECK!). In the case of an x-ray reflectometer, Dq is 0.01. The Dl is negligible (~0.0015). Polarised neutrons Select the [Experimental parameter]. In the ComboBox, change from "non polarised" to "polarised". Calculated the reflectivity. Two curves are plotted. The red curve is the "up-up" reflectivity. The blue curve is the "Down-Down" reflectivity. Change the magnetisation (set by default at 0.6 B/atom) to 1.0 B/atom (you get closer to the permalloy values). Calculate the reflectivity. Note that the "splitting" between the two curves has increased. When you select the option "polarised" in the comboBox, the program always assumes an in-plane magnetisation (the theta and phi parameters are not taken into account). NOTA: there are more sophisticated options for non collinear magnetisations. See section XXX. Description of the different elements of the program Description of the different panels Input/Output It reminds you of the current data file and fitting file. You can also give header lengths (number of lines) in the case you have put some comments at the beginning of your data files, or in the beginning of your wavelength or theta spectrum description. The group Theta / Qz let you choose between calculations using theta abscissa or Qz abscissa. When loading a file, if the abscissa type is not given in the header, the program assumes either milli degrees or nm-1 depending on what is checked in the radio button control. You can check the box Voice messages to obtain vocal messages when fits of plots are finished. Experimental parameters Particles : Neutron/X-ray: select the wave you want Tip: do not forget to modify the wavelength ! Measurement type : select via the combo box [non polarised] : suitable for x-rays and unpolarised neutron reflectivity; the magnetisation is not taken into account. [polarised] : suitable for polarised neutron with in-plane magnetisation aligned with the applied magnetic field [with spin-flip] : suitable for PNR where you have an in-plane magnetisation not necessarily aligned with the external applied field. The applied should be low (<100mT). Typically : spin-valves. [with SF High field] : general case, ANY magnetisation direction, ANY direction and magnitude of the applied field. This calculation takes into account the Zeeman energy effects. Lambda: several possibilities are offered. One single wavelength : give the lambda value. If you load a lambda spectrum file the [Full spectrum] box will be checked and your full spectrum will be used for the calculation (you can uncheck the box, and then the calculation will be done with a single wavelength again.). If you are lazy you can give a FWHM width and a number of points to describe a wavelength spectrum. Every time you modify the FWHM or nr. of points, the program generates a corresponding gaussian shaped wavelength spectrum and uses it. Theta : definition of the incident angular resolution. Same as the lambda spectrum (except that there is no central value. Angles : In the case you simply want to calculate reflectivity curves you can provide a starting angle, and ending angle and a step. The reflectivity is then calculated. Normalisation: This normalisation factor can be given and is applied to the calculated data so that you do not need to reprocess your experimental data. This can be useful in the case of x-ray reflectivity data but should be avoided. A proper normalisation is essential for a proper fitting. It should in principle not be left as a adjustable parameter. Fitting This panel let you follow the fitting process. Stability This allows you to check the influence of different parameters. In a model, parameters can have very different influences on the reflectivity. It is also possible to do 2D plots to look for local minima and to follow the influence of two parameters at a time. Multilayers At the moment, this is limited to giving the number of times your elementary structure is repeated . Further improvement could include a thickness spread. The tendency is however to avoid ML structures. Field This let you give the applied magnetic field magnitude and direction. The axis are defined as follow : (Oz) is the perpendicular to the sample; (Ox) is the incident beam direction. [theta] and [phi] are the polar angles defining the field direction. X-rays A small memo of the basic of x-ray reflectivity. A directory [StructFact] contains the scattering form factors of all the elements for the all x-ray spectrum. The typical wavelength of 0.154 nm (copper) corresponds to an energy of 8.06 keV. Profiles Work in progress But somewhat already usable. Diffuse This panel allows to define parameters associated with diffuse scans. Description of the menus [File] [Open data file] This opens your experimental data file. The format of the data file is the following: a n lines header (for your personal comments); you have to give the header length (in lines) in the INPUT/OUPUT panel. Then your experimental data follow: In the case of non polarised particles, you can give 2 or 3 columns. The first must be the incidence angle; the second must be the measured reflectivity; you can add a 3rd column which will be considered as the error bars on your data and can be used in weighted fits In the case of polarised particles, you can give either 3 columns or 5 columns. In the case of 3 columns, they will be considered as theta, up-up, do-do. In the case of 5 columns, they will be considered as theta, up-up, error up-up, do-do and error do-do. The separator can be either a SPACE or a COMMA Do not leave blank lines in the file, this upsets the program (since it reads as 0 0 0) [Copy data from clipboard] The same as above if your are too lazy to save your data in a text file. But it is more flexible for test purposes. [Save reflectivity curve] This allows you to save your calculated reflectivity curve in a text format. [Paste reflectivity curve] This copies the calculated reflectivity curve into the clipboard and let you paste it in your favorite plotter. N.B. by default, all the calculated results are copied into the clipboard. [Open lambda spectrum] Let you open your wavelength spectrum. File format : a few header lines to be given A two columns file : lambda (nm) SPACE/COMMA relative intensity (a.u.) Do not leave blank lines! [Open theta spectrum] Let you open your theta distribution file File format : a few header lines to be given A two columns file : theta (deg) SPACE/COMMA relative intensity (a.u.) Do not leave blank lines! [Open fit file] Opens a previous fitting file (has to be an Excel 5 file). Do not try to hand make fitting files. [Save fit file] Saves your current fitting results into an Excel 5 file. [Calculation] [Calculate reflectivity] Calculate the theoretical reflectivity curve corresponding to the entered model and experimental parameters. [Calculate reflectivity + phase] Also plot the reflectivity phase in the bottom graph [Calculate difference] Plot the difference between the experimental and calculated data in the bottom graph (evaluated using Eq. XX) and also gives your the [Calculate diffuse] Work in progress [Fit] [Simulated annealing] Fit using a simulating annealing method. [Crawling] Fit using a crawling method. [Crawling random] Fit using a random crawling method. [Gold search] Fit using a Gold search method. [Windows] Let you display a 2D plot windows to evaluate the influence of different parameters [Help] Display the version information [Bug report] Let you report the bug you have encountered or the complains you have about the software ergonomy [Trash] For test purposes only. Model description The model of the system you want to fit is described by an Excel like table. Each line represents a layer of your model. The first line is the substrate, the last line has to be the vacuum of the incidence medium. Each layer is characterised by a series of parameters (defined in the columns) [Y/N] You can tell if you want to use this layer in your model by setting the first column to (Y)es or (N)o. This avoids to destroy it. [Description] A small comment you can put to remind yourself what this line was supposed to be. [z] thickness, in nanometers [nm] The thickness of your layer. [d] density in unit cell per cubic meters, [m-3] The density of your materials in atoms per m3 or in unit cells per m3. [b] [bi] neutron scattering lengths in fermis [fm] The real and imaginary parts of the neutron scaterring length. [M] magnetisation in Bohr magneton per unit cell Magnetisation of your material. [theta] and [phi] in degrees Polar angles describing the magnetisation direction magnetisation in Bohr magneton per unit cell [sigma] in nm Roughness of the layer in nm [xsi] in nm In-plane correlation length of the layer [h] no unit Critical exponent describing how jagged the surface is. h = 0.5 corresponds to a Gaussian surface. [ML] no unit Y or N Tells if the layer belongs to the multi-layer motif [h] no unit Profiles [h] no unit [h] no unit After each of the fittable parameters column there is a column which enables you to tell if you want to fit this parameter or not. The parameter will be fitted if you put Y in the column. In the case of the crawling method, you can put the step you want the program to use. If no step is given, the program uses a percentage of the parameter value. This percentage is given by the box Step % in the [Fitting] panel. Inserting a new layer If you want to insert a new line in your description, click on the line above which you want to insert your layer (select the whole line by clicking on the row number). Then in the [Model] menu, select [Insert layer], this inserts a blank line. Then you have 3 options : you can either fill it by yourself you can select the above layer and pull on the black square at the bottom left of the selection you CANNOT directly do a Copy Paste operation you can open the description table by double clicking on the right mouse button. The sheet is then opened in a new window and you can edit it in the same way as in Excel. Close it to go back to the main program. N.B. you cannot keep it opened. Graphical window A separate window displays all the graphical data. You can change the horizontal and vertical scales by using the xmin, xmax, ymin, ymax boxes. A useful feature in the Numerical Box in the graphs is the possibility to divide or multiply the Ymax or Ymin ranges by 10 when pressing the up and down arrows (this is especially useful in LOG scales. It is possible to zoom on a part of the graph with the mouse. Press SHIFT while defining the zooming region with your mouse. Pressing on the button LIN/LOG toggles between an linear or logarithmic scale on the y-axis. The button [STORE] let you copy the current up-up, do-do and spin-flip calculated curves into 3 other curves for comparison purposes (to see what is the influence of some parameter variation for example). However, this system is rather crude, and comparing complex sets of curves in the present version of the program is not very practical. My advice is that you should paste the calculated data into your favourite grapher in order to do proper comparisons. 2D surfaces window This window let you plot 2D data. These data can be issued from stability calculations (to look at the local minima in a 2D space). This window can also be used to visualise full diffuse scans in the reciprocal space (at the moment, the axis are limited in qin and qout). File formats Data files The data files can contain a header but this is not compulsory. If a header is present, it can contain the following data. The format : # KeyWord = MyValue is compulsory. At the moment 5 keywords are available : Comment possible value any string Particles possible value neutrons or xrays Polarisation possible value non polarised or polarised or with spin-flip or with SF high field AbscissesUnits possible value deg or nm-1 TimeOfFlight possible value True or False Example # Comment = My data are of very good quality # Particles = neutrons # Polarisation = non polarised # AbscissesUnits = nm-1 # TimeOfFlight = False 2 0.3 3 0.7 4 0.1 The experimental data must be given as follow : For non polarised particles, you can give 2 or 3 columns. The first must be the incidence angle () or the Qz value (nm-1); The second must be the measured reflectivity; You can add a 3rd column which will be considered as the error bars on your data and can be used in weighted fits. Example MyAngle () TAB/SPACE MyIntensity [TAB/SPACE Sigma] For polarised particles, you can give either 3 columns or 5 columns. In the case of 3 columns, they will be considered as theta, up-up, do-do. In the case of 5 columns, they will be considered as theta, up-up, error up-up, do-do and error do-do. Example MyAngle TAB MyIntensity [TAB/SPACE Sigma] The separator can be either a SPACE or a COMMA Do not leave blank lines in the file, this upsets the program (since it reads as 0 0 0) Fit files The fit files are saved as Excel files. They contain four sheets : Multilayer This sheet contains the description of your model. Parameters This sheet contains the values of all possible experimental parameters. The first column contains the name of a field, the second column contains its values. The first column names correspond to keywords and the spelling should not be changed (otherwise the program will not update properly its value) However you may change the order of the different lines (this order is not strict) Lambda spectrum This sheet contains a description of the wavelength spectrum. Theta spectrum This sheet contains a description of the angular resolution spectrum. The model of your multilayer can also be exported as an html page. The experimental parameters can also be exported as an html page. Unless you know what you are doing, you should not edit the fit file by hand (though it is perfectly feasible). The only risk is that you may loose some experimental parameters because you did not use the correct keyword Resolution files It is possible to provide resolution files for the wavelength resolution function and for the angular resolution function. These resolution functions must be approximated by discrete points equally spaced. The relative weight of the different points must be provided. The total weights do not need to be normalised to 1 (this is taken in charge by the program). For wavelengths The file format is the following. A two columns file : lambda (nm) SPACE/COMMA/TAB relative intensity (a.u.) The intensities do not need to be renormalised they can be given as relative values Example 0.41 0.0544 0.42 0.2442 0.43 0.4026 0.44 0.2442 0.45 0.0544 Do not leave any blank line in your file ! For the angular resolution The file format is the following. A two columns file : theta (deg) SPACE/COMMA/TAB relative intensity (a.u.) The intensity do not need to be renormalised they can be given as relative values Example -0.04 0.0544 -0.02 0.2442 0.00 0.4026 0.02 0.2442 0.04 0.0544 Do not leave any blank line in your file ! Experimental resolution processing Since Version 1.3, the experimental resolution can be processed in 2 ways. The first possibility is to provide a file describing the wavelength distribution and a file describing the angular resolution (see  REF _Ref12291032 \r \h 4.3). This proves to be quite useful in the case of some neutron experiment were the resolution cannot be approximated by a gaussian. The convolution is then performed by using all the points provided by the user, without any approximation. In the case of a fixed wavelength spectrometer, the intensity is calculated as  EMBED Equation.3  where  EMBED Equation.3 is the wavelength distribution function (approximated by discrete points),  EMBED Equation.3 is the angular distribution function (approximated by discrete points), R is the theoretical reflectivity, Imes is the total reflected intensity (integrated for a fixed position of the sample). The data file provided should (at least in principle) contain the angular positions of the sample which is the only value which has a real meaning. If you provide a qz value in the data file, this value is supposed to be the averaged weighted value of the scattering vector deduced from the wavelength and angular distributions (which YOU must have calculated properly). THE PROGRAM CANNOT THEN GUESS WHAT WERE THE EXPERIMENTAL CONDITIONS OF MEASUREMENTS (but it guesses the positions) In the case of a Time of Flight spectrometer, the intensity is calculated as The second possibility is to approximate your wavelength and angular resolution by using gaussian approximations. This second method allows much faster calculations. However it may introduce some distortions in the curves in some cases. The measured intensity is calculated as :  EMBED Equation.3  where  EMBED Equation.3  is the resolution function in the Qz space. The resolution function is approximated by a gaussian function of FWHM width  EMBED Equation.3 calculated as:  EMBED Equation.3  Since Version 1.2, the resolution is processed in the Qz space. This allows the fit of time of flight measurement. The second advantage is a much increased speed in processing the data. The drawback is that it is not possible anymore to use the detailed convolution of the dl and dq spectra (for that you should use V1.11). In the panel [Experimental parameters], there is a window which lets you set the experimental resolution (its title is  lambda theta . In the case of fixed wavelength measurements, give the central value of l. The  theta box is greyed and is not used. Give the FWHM of your lambda spectrum. Give the FWHM of your angular resolution. Give the number of points you want to use in the convolution (5 is a minimum to have an accurate description of the experimental resolution). The program generates a gaussian description of the resolution (calculated in the Qz space) using the number of points you have asked for. In the case of time of flight measurements, check the [Tof] check box. The theta box is then available. Set in the incidence angle. At the moment, the program can process only measurements made at a single incidence angle. The meaning of the other parameters is the same. Super-Lattices (SL) How to describe it The program can simulate the reflectivity/diffraction from super-lattices. At the moment the description is limited to one type of super-lattices (i.e. you cannot pile up different types of super-lattices on top of each other). Define your multi-layer system as usual but without describing the full repetition of the periodic motif. Just give the description of 1 motif and in the column [ML] put a "Y" which will mean that the layers you have entered form the repeated structure. Then in the panel [MultiLayers] , give the number of repetition in the box "Nb of ML". The calculation works for any type of polarisation : "non polarised", "polarised", "spin-flip", "spin-flip HF". Taking into account the dispersion in the layers thicknesses It is possible to enter functions to describe the thickness fluctuations of the layers (ANY type of functions) To add small random fluctuations on the SL layers : 0.4*Rnd(1) -0.2 introduces of flat random distribution of the thickness (between -0.2 and +0.2nm) on each layer 0.02*z introduces a linearly increasing thickness on each layer which is a function of the total thickness z of the super-lattice thickness. The other available mathematical functions are described in the Parser section. Assume that a f(z) function was given for the thickness function and that z1 and z2 are the thickness of the individual bilayers in the SL (as given in the Excel table "Layers"). The thicknesses are of the individual SL layers are generated in this way (Z designating the total SL thickness): z1+f(z1) = Z1 (thickness of the first layer) Z1+z2+f(Z1+z2) = Z2 (thickness of the second layer, 1st period finished) Zj+zj+1+f(Zj+zj+1) = Zj+1 (etc) Taking into account the dispersion in roughness It is possible to enter functions to describe the roughness evolution in a super-lattice system : 0.5*Rnd(1) introduces of flat random distribution of roughness (between 0 and 0.5nm) on the different interfaces 0.2+0.02*z introduces an increasing roughness on each interface starting at 0.2 nm for the first interface and then increasing linearly as a function of z (the total thickness of the super lattice) by 0.2 nm every 10nm. The other available mathematical functions are described in the Parser section. FITTING The different fitting methods Simulated annealing Uses a simulated annealing method to try to avoid staying in a local minimum. This method is very time consuming. Do not try to fit too many parameters at a time. Also, limit yourself to one iteration at a time (nbr itrations). Crawling Each parameter is successively displaced by a small quantity () defined after the value of the parameter. If the Step is 0, the variable is not adjusted. If the step is equal to Y, the program uses a percentage of the value(defined in the panel [Fitting]). Crawling random Same as crawling except that the order of the fitted parameter is chosen randomly. You have to adjust the randomness parameter to select how random the choice. Randomness/100 is the probability that the program tries to fit a parameter during a single iteration. If randomness = 80, for each fitted parameter, there is only 1 chance out of five that the program will try to fit it during an iteration. When the randomness is non zero, the number of actual iterations is multiplied by the inverse of the randomness. N.B. this procedure is not purely random since the program still scans the parameters on e after the other, but it is very close to randomness if you have small steps and a high randomness (>90). Gold search Close to crawling except that the program iteratively adjust the best parameter value, everything else being fixed, then go to the next parameter. Data weighting for fits Several types of weightings are available for the fits. No weighting : (linear form) Means that you do not take into account the statistical error on your points. The difference is simply renormalised by the total reflection. The difference between the experimental and theoretical curves is calculated as  EMBED Equation.3  The plotted difference (on the bottom graph) is defined as :  EMBED Equation.3  No weighting : (log form) The difference between the experimental and theoretical curves is calculated as  EMBED Equation.3  The plotted difference (on the bottom graph) is defined as :  EMBED Equation.3  This form is very close to the Linear form as for the results. It gives slightly more weight on the large q points but this depends on the system you are looking at. Least square: This is the official form that can be found in textbooks (e.g. Pelat "bruit et signaux" ) but it does not work at all for reflectivity signals because is over weights the early points and underestimate the last data points. It can be used to calculate the real chi square. The difference between the experimental and theoretical curves is calculated as  EMBED Equation.3  The plotted difference (on the bottom graph) is defined as :  EMBED Equation.3  Log form with least square type weighting The difference between the experimental and theoretical curves is calculated as  EMBED Equation.3  The plotted difference (on the bottom graph) is defined as :  EMBED Equation.3  Advice for fitting Do not try to fit everything EN PRATIQUE : un fichier en dL a trois points est trs largement suffisant pour obtenirdes fits corrects, au dela de trois point, les corrections deviennent mineures, surtout en comparaison des autres details inftittables. on gagne un tout petit peu si on prend un dtheta 5 points plutot qu'a trois points Stability The stability panel allows you to test the influence of different parameters of your model and how large is their influence on the reflectivity curve. You can do either one dimensional plot, in which case you have to check either para1 or para2. But be careful, you can check both para1and para2 but if their dimensions are very different (thickness vs M), the result on the plot could be difficult to read. You should plot only the variation of one parameter. It is also possible to look at the influence of two parameters at a time on a 2D plot. In this case, check the box 2D. The 2D map is displayed on the 2D window that you can display via the [Window][Surfaces2D] menu. You have to give the parameter you want to vary (rho, b, M) the layer it belongs to, its varying range and the number of points you want to calculate. N.B. for 2D plot, do not ask for more than a 1000 points, otherwise it gets very long to calculate. Use of profiles It is possible to create a smooth profile in the case where you have a smoothly varying quantity (such as the density or the magnetisation or the magnetisation angle for example). In the tab Profiles youll find a table which let you describe the type of profile you want. Each line let you describe a different profile. The different parameters you must provide are the following : [ layer nr.] the layer that you want to slice into smaller layer to create a gradient of some quantity [ parameter ] the parameter you want to vary (it can be rho, bn, bni, f, fi, M, theta, phi) [ bottom ] [top] [nbr steps], the value of the smoothly varying parameter at the bottom (substrate side) and at the top (vacuum) side of your profile and the number of sublayers that you want to create. [Profile type ] must be set as smooth at the moment [Profile para ] weighting parameter to limit the gradients in the profile. The pressing the [GENERATE] button will replace the layer youve asked for by a new stack of nbr steps layers (with a thickness that has been calculated accordingly) and it will also make the parameter youve asked for vary as a linear function of the depth in the system (see [bottom], [top] and [nbr steps]). You could have introduced these different layers by yourself BUT first of all it is easier to generate these layers with the Profile function and second, the created layers are introduced as profile layers. Since you have introduced these layers into a profile, this suggests that you do not expect drastic variations of the [parameter] in the profile. This is why a weighting parameter has been introduced (very right of the System Description table). This weight is a parameter which prevents having variations which are too abrupt in your profiles. It weights the variations of the variable parameter in your profile (from one layer to the other) and add it to the calculated difference between the experimental and calculated curves. Thus layers in a profile should not have drastic variations of their parameter. But of course, if you set the weight parameter as zero, it is again as if the layers were independent. NOTA: be careful, this weighting parameter is empirical and depends a lot on your experimental data. The weight can easily take over the actual difference between the curves. Check the ECART value when testing its value. It is yet 100% empirical. NOTA : at the moment, the use of profiles prevents the use of the box Y/N in the system description. When you generate your profile, all the unchecked layers will disappear. NOTA : profiles can always be used to generate a profile in the system description but the weighting system only works with the crawling type fitting system at the moment (V1.1). Remarks on the high magnetic case measurements When applying large magnetic fields on you system, the Zeeman energy splitting between the neutron up and down states may start to play a role. Most of these effects can be seen when there is some spin-flip signal. Experimentally, this has been observed in [Felcher95]. The implementation follows [Fermon95, Ott98, Fermon99]. Diffuse signals simulation It is possible to calculate diffuse scattering from multilayer systems. Diffuse scattering in a reflectivity measurement corresponds to in-plane correlations of the roughness at the interfaces of the different layers of your multilayer system. The most convenient way to introduce in-plane structures is to use a in-plane correlation function of the type  EMBED Equation.3  Sigma (s) describe the roughness of the layer Xsi (x) describes the in-plane correlation length which is the/a in-plane characteristic length of the in-plane correlations. H is a exponent which describes how jagged the surface is For gaussian surfaces, one would have h = 1. Actually for thin films, the exponent h is always much lower The program let you calculate diffuse scans of the following type: Rocking curves (at a fixed detector position) Detector scans (at a fixed sample position) Longitudinal scan (i.e. w = 2w / 2 - Dw). 2D scans (theta in VS theta out). The plots are generated in a separate 2D window. In order to normalise the diffuse signal, one needs to know the sample size as well as the beam size. The calculation is done by integrating over the (Oy) direction. The scans are plotted in the bottom window It is not yet possible to fit the correlation function parameters You can also choose the x-axis parameter. It is possible to prevent the data normalisation to get symmetrical scans. Normalisation At the moment the normalisation is not absolute because of technical problems. In later version, the diffuse scattering signal should be calculated without any need for a post normalisation. Bug reporting You are asked to report the bugs you encounter, the improvements you would like or the things which look really awkward to you. In order to make it easier for lazy people, you can click on DEBUG, this opens a mini mail server, you simply have to fill the form and send your complains. Since you are not necessarily connected to a network, the program does not activate the connection by default. Before sending your e-mail, you should click on the [connect] button to activate the network connection. Tips All the calculated data are automatically copied into the clipboard so that you can paste them into your favourite plotter (K-graph, Excel, Origin?). To deactivate a layer, use N in the first column, do not set its thickness to zero. It makes a big difference to set a thickness at zero or to deactivate a layer. The roughness parameters plays a role even if the thickness of a layer is set to zero (the program supposes that there are fluctuations of the order of sigma. Parser The program let you enter functions so as to describe varying parameters in your system. The list of available functions is the following: Predefined constants: PI Accepted operators: + , - , * , / , ^ , MOD, DIV [ MOD and DIV implicitly perform a trunc() on their operands ] The following functions are supported; it doesn't matter if you use lower or upper case: COS, SIN, SINH, COSH, TAN, COTAN, ARCTAN, ARG, EXP, LN, LOG10, LOG2, LOGN, SQRT, SQR, POWER, INTPOWER, MIN, MAX, ABS, TRUNC, INT, CEIL, FLOOR, HEAV (heav(x) is =1 for x>0 and =0 for x<=0), SIGN (sign(x) is 1 for x>1, 0 for x=0, -1 for x<0), ZERO (zero(x) is 0 for x=0, 1 for x<>0), PH (ph(x) = x - 2*pi*round(x/2/pi)) RND (rnd(x) = int(x) * Random) RANDOM (random(X) = Random; the argument X is not used) Important: Do not use blanks in the expression. The parser is unable to handle these and raises an exception in response. Use of mathematical expressions The use of such functions can be useful for describing thickness or roughness fluctuations is a super-lattice system. See corresponding chapters (Super-Lattices) To be done: The program is very sensitive to errors in the lambda spectrum file No blank lines should be left after the definition of the spectrum At theta = 0, there are serious problems (patched) Calculation of off-specular signals Possibility to work with TOF data take into account experimental statistics weighting fonctions introduce varying parameters for the multilayers (increase roughness) and/or fluctuating thicknesses Distribution gaussienne des paisseurs ou des rugosits : introduire une fonctions RandGauss References Here is some literature that can be useful for reflectivity problems Specular reflectivity X-ray and neutron reflectivity: principles and applications (ed. J. Daillant and A. Gibaud, Springer, 1999). V. Holy, U. Pietsch, T. Baumbach, High-resolution X-ray scattering from thin film and multi-layers, Springer Tracts in Modern Physics n149 (Springer, Berlin, 1999). G.P. Felcher, R.O. Hilleke, R.K. Crawford, J. Haumann, R. Kleb and G. Ostrowsky, Rev. Sci. Instrum. 58, pp. 609-619 (1987). "Polarized Neutron Reflectometer: A New Instrument to Measure Magnetic Depth Profiles." G.F. Felcher, Physica B 192, pp. 137-149 (1993). "Magnetic Depth Profiling Studies by Polarized Neutron Reflection." G.F. Felcher, Physica B 198, pp. 150-155 (1994). "Forward Scattering of Neutrons from Polymeric and Magnetic Multilayers." G.P. Felcher, S. Adenwalla and R.J. Goyette, J. Appl. Cryst. 30, pp. 195-197 (1997). "The Effect of Laboratory Magnetic Fields on Neutron Reflection" G.P. Felcher, S. Adenwalla, V.O. De Haan and A.A. Van Well, Nature 377, pp. 409-410 (1995). "Zeeman Splitting of Surface-Scattered Neutrons." G.P. Felcher, S. Adenwalla, V.O. de Haan and A.A. Van Well, Physica B 221, pp. 494-499 (1996). "Observation of the Zeeman Splitting for Neutrons Reflected by Magnetic Layers." C. F. Majkrzak, J. W. Cable, J. Kwo, M. Hong, D. B. McWhan, Y. Yafet and J. Waszcak, Phys. Rev. Lett. 56, 2700 (1986). F. Ott, Thse de l'Universit Paris-XI (1998). J. Penfold, R.K. Thomas, J. Phys. Condens. Matter 2, 1369-1412 (1990). T.P. Russell, Mat. Sci. Rep. 5, 171-271 (1990); T.P. Russell, Physica B 221, 267-283 (1996). W.G. Williams, Polariszed Neutrons (Oxford Science Publications) P6438. Zhou Diffuse scattering H. Frederikze et al., Physica B 248 (1998) 157. R. Gunther et al., Phys. Rev. Lett. 81 (1998) 116. "Birefringent Bragg Diffraction of Evanescent Neutron States in Magnetic Films." W. Hahn et al, J. Appl. Phys. 75 (1994) 3564. "Fe/Cr multilayers: effect of annealing on the spin structure and magnetoresistance" T.J. Konno, J. Phys. Soc. Jap. 67 (1998) 1498. "SANS study of sputter-deposited Fe30Cu70 thin films" W.H. Kraan et al. J.M.M.M. 120 (1993) 372. "Domain wall effects in neutron depolarisation in Co/Cr films" W.H. Kraan et al. Physica B 267-268 (1999) 75 "Domain structure in FeCo/TiZr ML analysed from 3D depolarisation" Th. Krist et al, Physica B 267-268 (1999) 194-197. Non specular reflectivity of spin-flipped neutrons L. Mandel et al., Optical coherence and quantum optics (Cambridge University Press, 1995). Messiah, Mcanique Quantique (Dunod, Paris, 1995). J.A. Ogilvy, Theory of Wave scattering from random rough surfaces (IOP Publishing Ltd, Bristol, 1991). P.T. Por, J.M.M.M. 161 (1996) 357 "The magnetic structure of metal-evaporated tape studied by neutron depolarisation" V.M. Pusenkov, J.M.M.M. 175 (1997) 237. "Study of domain structure of thin magnetic films by polarised neutron reflectometry" M. Th. Rekveldt et al. J.M.M.M. 78 (1989) 110. "SANS experiments on thin CoCr films with perpendicular domain structure" M. Th. Rekveldt, Physica B 267-268 (1999) 60. "Transmission of polarised neutrons in magnetic materials" R. Rosman et al., Z. Phys B 79 (1990) 61-68. "Neutron depolarization theory in the Larmor and the scattering approach" R. Rosman et al. Phys. Rev. B 43 (1991) 8437. "Neutron depolarization theory in particulate media." S.K. Sinha et al., Phys. Rev. B 38 (1988) 2297. J. Suzuki et al. J.M.M.M 184 (1998) 116 "SANS study of microstructure in Co-Cr films" B.P. Toperverg, Physica B 267-268 (1999) 198-202. "Polarized neutron grazing angle birefringent diffraction from magnetic stratified media". Surface diffraction H. Dosch et al. Rev. Sci Intr. 63 (1992) 5533-5542 H. Dosch et al. Physica B 192 (1993) 163 H. Dosch et al., Neutron News 6 (1995) 19. Credits Laboratoire Lon Brillouin CEA/CNRS Centre dEtudes de Saclay 91191 Gif sur Yvette France Cedex FRANCE All problems should be reported to : Frdric OTT :  HYPERLINK "mailto:fott@cea.fr" fott@cea.fr Other people who have contributed: Trong-Duc Doan, P. Humbert, C. Fermon. This program also uses the following libraries: XYgraph : an fast, light and efficient 2D curve plotter by HYPERLINK "mailto:grahameg@kestral.com.au"Grahame Grieve, Kestral :  HYPERLINK http://www.kestral.com.au/devtools/xygraph http://www.kestral.com.au/devtools/xygraph Kim Kirkpatrick, Jeff Sinclair, David Arnall, David Berneda, Finn Knut Hansen, Frank Schmidt, Hendrik Levsen, Lars Tippman, Jeff Roberts, John Biddiscombe, Paul Bailey, Ross Lazarus, Oleg V. Karenkih, Wim Hilbrants and Sean Violante Graphics32 : Copyright (c) 2000 Alex Denissov  HYPERLINK http://www.geocities.com/den_alex http://www.geocities.com/den_alex denisso@uwindsor.ca A superfast library to handle 32 bits graphics MtxVec : a Lapack libray for Delphi :  HYPERLINK http://www.dewresearch.com http://www.dewresearch.com for linear algebra calculations TPMATH1 (c) J. Debord, August 2000 MATHEMATICAL LIBRARY IN PASCAL debord@.unilim.fr  HYPERLINK mailto:JDebord@compuserve.com JDebord@compuserve.com for the robust fitting procedure for simulated annealing fits : SimOpt.pas GaussLegendre.pas picked form EFGs computer lab  HYPERLINK http://www.efg2.com/Lab/Mathematics/GaussLegendre.htm http://www.efg2.com/Lab/Mathematics/GaussLegendre.htm TMS GridPack :  HYPERLINK "http://www.tmssoftware.com" www.tmssoftware.com This component is used for managing the different grids. History Version 1.0, 08.08.01, Release to the public domain Known problems: Display problems when messing non polarised and polarised data To be done: Implementation of the diffuse scans Version 1.1, New: Implementation of diffuse scans (without spin-flip) Easier manipulation of the system description (INSERT, COPY, PASTE, DELETE) More flexible way of saving the fitting files (but keeps the compatibility with version 1.0) (the changes are transparent to the user) Possibility to simply compare two sets of curves (see [STORE] button) Proper calculation for super lattice systems (in all polarisation cases) Introduction of functions to describe thickness fluctuations and roughness increases in SL systems It is now possible to fit spin-flip and high field data (option "with spin-flip" and "with SF high field") However, the roughness is not taken into account To be done: a proper profile fitting interface Known problems : If one loads a fit file, a gaussian lambda spectrum and theta spectrum is generated which overrides the lambda or theta spectrum you may have loaded previously from a text file. This is the case at the moment because nobody cares using the text file lambda or theta spectra. Version 1.3, 19.06.01 New : The program is now compatible with Windows 2000 The internal data structure has been completely upgraded (for future developments) A much improved format for the fit files (they now contain all the information on the experimental conditions) The data files can now contain some information on the measurement conditions The management is now much more user friendly (the last data files and fit files are now reloaded at startup) Known problems : The procedures taking into account high magnetic fields are not implemented any more The diffuse scattering module has not been upgraded for this version The 2D plots are not available any more To be done : Implement fits of multiple data sets Implement the diffraction on gratings PAGE 1 PAGE 12 '(:()348@BCQRSTXYZstuvwպ{shsZhshjUmHnHujUmHnHumHnHsH uCJaJmHnHsH uaJmHnHsH u jU5CJOJQJmH sH mH sH OJQJmHnHujOJQJU0JOJQJmHsHjOJQJUmHsHjOJQJUmHsHOJQJmHsHOJQJmH sH OJQJ CJ`OJQJ#     !()*+,-$a$-./0123456789:Gt578@$a$@ABx OB%T 7 s  M {  f#   f#  f# wxyz     /01JKLMNORS۴۞ېjUmHnHuj$UmHnHuaJmHnHujUmHnHuj.UmHnHujUmHnHu mHnHuCJaJmHnHuaJmHnHuCJaJmHnHsH u3"#$=>?@ABEFijk׹׹jUmHnHujUmHnHujUmHnHuaJmHnHujUmHnHuaJmHnHuCJaJmHnHu mHnHujUmHnHujUmHnHu7 !"#$%*+456OPQRSTYZefgjmUmHnHujUmHnHujwUmHnHujUmHnHuaJmHnHuCJaJmHnHu mHnHujUmHnHujUmHnHu7         2 3 4 5 6 7 : ; S T U n o p q r s v w j UmHnHujY UmHnHujUmHnHujcUmHnHuaJmHnHuCJaJmHnHu mHnHujUmHnHujUmHnHu7         - . / H I J K L M N O [ \ ] v w x y z { ~  ׫׫j; UmHnHuj UmHnHuaJmHnHujE UmHnHuj UmHnHuaJmHnHuCJaJmHnHu mHnHujUmHnHujO UmHnHu7      ! 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