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Athletics-pick z stray field

Step 11 A Lorentz contrast image will appear

Athletics-z stary input

Step 13 Input the height above the sample to measure the stray field; this must be in integer multiples of the resolution e.g. if the resoltuion was 10nm then inputting a value of 1 would produce an image of the out-of-plane stray field at 10nm above the sample. The maximum value is 3 times the number of cells in the sample thickness (=thickness/resolution)

Athletics-pick lorentz image

Step 8 An electron holography image will appear

Athletics-pick holog_image

Step 6 To create an off-axis electron holography image, select Holography_Image from the macro menu

Athletics-pick data

Step 4 Choose data of the form .txt or .llg_dom

Athletics-phase map

Step 5 A 2D phase map will appear of your input data averaged along the z direction and with empty space around the sample.

Athletics-loretz image

Step 11 A Lorentz contrast image will appear


Step 10 Input microscope parameters to produce a Lorentz image; the parameters shown are only example parameters for this case


Step 7 Choose an holography density value; typically a value around 3 works well for a 50nm thick sample. Choose whether to include a mean inner potential in your holography image. A vlaue of 0 doesn't include a mean inner potential (default), a value of 1 does include it.

Athletics-dec1st ra...nd interp

Step 17 An interpolated and thickness ramped phase map, holography image and Lorentz contrast image will appear. Note the fringes have gone from the Lorentz image and all images are less pixelated. Also note the effect of the thickness ramp where features get less intense as the sample gets thinner. The thickness ramp has no effect on the out-of-plane stray field images; see the the details of the interpolation_thickness macro below. To save any of these images, click on the image then select the 'File' tab and select 'Save Graphics'

Athletics-holog image

Step 8 An electron holography image will appear


Step 1 Double Click the ATHLETICS icon to launch Igor Pro.

Athletics-dec1st result

Step 14 An out-of-plane stray field image will be produced; red corresponds to positive, blue to negative and the colour intensity corresponds to magnitude

Athletics-dec1st pi...int_thick

Step 15 To either interpolate the images to create smoother pictures, or add a constant thickness ramp to the images select interpolation_thickness from the macro menu.

Athletics-dec1st input

Step 16 Input an interpolation factor; about 2 produces noticeably clearer images. Input the thickest and thinnest points of the sample and the angle of change between these to add a thickness ramp. The thickest and thinnest points should correspond to the actual sample thickness and the angle of the ramp is in degrees from the positive y direction, between -180 and 180 degrees. An angle of 45 degrees here corresponds to a thickest point in the lower left corner and thinnest point in the upper right corner of the sample


Step 2 Select Data_Loader from the Macros menu to load .txt or .llg_dom data

Athletics-data_loader new

Step 3 Input the Bo and Vo value for your material, and the accelerating voltage corresponding to the microscope setting.

ymag microstructure

y component of the magnetisation for a user defined function in IGOR Pro


The y component of the magnetisation changing between 1 and -1 across the wall


The xcomponent of the magnetisation, which in this example is zero through out the simulation

xmag microstructure

x component of the magnetisation for a user defined function in IGOR Pro


Lorentz contrast image of the magnetic domain wall sowning fringes of specific amplitude and spacing

lorentz si...microstuc

Lorentz Image created from the user defined microstructure

line profi...ingle MDW

Line profile across the red line on the Lorentz image showing the fringes

line profi... freehand

Selecting horizontal or vertical freehand allows for user defined line profiles

image line profile

Select the 'Image Line Profile' option from the 'Image' tab

image line... advanced

A horizontal blue line and the corresponding line profile are created. This can be changed using the tab in the top left

holog sim microstuc

Holography Image created from the user defined microstructure

3d wave display

Select '3D Wave Display' from the 'Image' tab

3d wave di...ay choose

Select 'Bkz_IFFT' and click OK

3 view panel

The left window shows the z plane corresponding to the slider above it



Earth Sciences at Cambridge

Booking for the Cambridge Open Days on Thursday 5 and Friday 6 July 2018 is now open

Further information

Saturday 22 September 2018: A one-day conference bringing together international scientists to mark 200 years since Adam Sedgwick was appointed to the Woodwardian Chair of Geology.

Further information