Figure 3a: A color map of the magnetic induction vector of circular element calculated from the reconstructed phase of the electron wave shows a magnetic vortex structure (inset: color wheel showing the direction and
magnitude of the magnetic induction vector). The structure was prepared by sputter deposition of Ni80Fe20, 40 nm thick, on a SiN amorphous substrate, followed by e-beam lithography to form a circular element, 1µm
in diameter. The phase of the electron wave was reconstructed from a focal-series of Fresnel-contrast images on the TEM modified to function as a Lorentz TEM for magnetic imaging. Note the strong contrast at the
edge of the circular element, which is due to a step change in the electrostatic mean inner potential. (Research from the group of Prof. of Amit Kohn, Dept. of Materials Engineering, BGU).
Figure 3b: A color map of the magnetic induction vector of square Ni80Fe20 element. (Research from the group of Prof. Amit Kohn, Dept. of Materials Engineering, BGU).