Predicted defect induced vortex core switching in thin magnetic nanodisks

Details Predicted defect induced vortex core switching in thin magnetic nanodisks Predicted defect induced vortex core switching in thin magnetic nanodisks

2009-09-24

arxiv.org/abs/0909.4515v1

Physical Review B 78, 054423 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11pages, Revtex format, 17 figures

Scientific paper

10.1103/PhysRevB.78.054423

We investigate the influence of artificial defects (small holes) inserted into magnetic nanodisks on the vortex core dynamics. One and two holes (antidots) are considered. In general, the core falls into the hole but, in particular, we would like to remark an interesting phenomenon not yet observed, which is the vortex core switching induced by the vortex-hole interactions. It occurs for the case with only one hole and for very special conditions involving the hole size and position as well as the disk size. Any small deformation in the disk geometry such as the presence of a second antidot changes completely the vortex dynamics and the vortex core eventually falls into one of the defects. After trapped, the vortex center still oscillates with a very high frequency and small amplitude around the defect center.

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