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Vortex nucleation in sub-micrometer ferromagnetic disks

Rahm, M ; Schneider, M ; Biberger, Josef ; Pulwey, Ralph ; Umanski, V ; Zweck, Josef ; Weiss, Dieter


We investigate both experimentally and by means of micromagnetic calculations magnetic states preceding vortex formation in permalloy nanodisks. In experiment, we used micro-Hall sensors fabricated from GaAs/AlGaAs heterojunction material to measure stray field hysteresis loops of individual disks. Micromagnetic calculations involving different micromagnetic codes allowed us to interpret ...


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