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Transition of magnetocrystalline anisotropy and domain structure in epitaxial Fe(001) nanomagnets

Pulwey, Ralph ; Zölfl, M ; Bayreuther, Günther ; Weiss, Dieter


We studied the interaction between magnetic vortices and artificial point defects by using micro-Hall magnetometry. Disk-shaped Permalloy particles with diameters between 300 and 800 nm and thicknesses from 20 to 60 nm, which contain a single lithographically defined defect, were examined. Magnetization reversal curves were measured for different in-plane directions of the applied field. The data indicate that the magnetic vortex structure can be pinned at the point defect.

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