Vortex nucleation in submicrometer ferromagnetic disks

Rahm, M.; Schneider, M.; Biberger, J.; Pulwey, R.; Zweck, J.; Weiss, D.; Umansky, V.
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4110
Academic Journal
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 experimental results. Both calculations and experiments suggest that vortex formation can be reached via different precursor states.


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