edfas.org 9 ELECTRONIC DEVICE FAILURE ANALYSIS | VOLUME 26 NO. 1 Fig. 3 Panel I: A schematic depicting the behavior of the diffraction disks as a function of potential. If there is no gradient the disk does not shift (a). The diffraction pattern shifts rigidly when experiencing a constant gradient (b), while the intensity within the diffraction disks is redistributed when the potential is smaller than the electron probe (c). α is the probe convergence semi-angle. Panel II: Competition between diffraction contrast and magnetic field contrast in a polycrystalline FeGe thin film can be observed as a function of collection angle. COM in the x direction as a function of collection angles: (0 to 430) μrad (a); (0 to 700) μrad (b); and (430 to 700) μrad (c). Grain contrast is evident in (a) while in (c) contrast due to the magnetic fields are greatly enhanced. Because both signals are present in the 4D dataset both crystallographic (d) and magnetic induction (e) orientation maps can be calculated. The scale bar in (d) is equal to 200 nm. Reproduced with permission from Ref 53. I. II. (a) (b) (c) (a) (b) (d) (e) (c)
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