Vortex nucleation in submicrometer ferromagnetic disks

Rahm, M. ; Schneider, M. ; Biberger, J. ; Pulwey, R. ; Zweck, J. ; Weiss, D.

; Umansky, V.

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Zusammenfassung

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 the ...