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A multilayer changes its reversal behavior if deposited on spheres with diameters of [(a)–(d)] or [(e)–(h)] . The STXM images are taken in different applied magnetic fields. Note that the magnetic film in the interstices between the spheres [some are marked in (a) with dotted circles] show opposite contrast, i.e., reversed magnetization, with respect to the caps on the particles.
(Color online) Magnetization loops deduced from the XMCD signal at the Fe edge, locally integrated on individual spheres with diameters of 800, 330, and . A strong change in the shape of the hysteresis is visible for caps with diameters of 800 and , indicating a different, size-dependent reversal mechanism. For clarity, the signals of the 330 and spheres have been increased by a factor of 3, and the sign of the XMCD contrast has been reversed.
(Color online) (a) Line scans of 800 and caps reveal the spin configurations sketched in the insets. A radial distribution is used to fit the signal. Deviations of the STXM data from the fit for angles result from dipolar interactions with a neighboring sphere.
(Color online) Element selective Fe and Gd magnetization loops, taken at the Fe and the Gd absorption edges. (a) Measurement for the multilayer at the flat substrate. (b) The magnetization curves of the caps reveal a twisted magnetic state.
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