期刊
APPLIED PHYSICS LETTERS
卷 96, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3291064
关键词
ground states; magnetic domain walls; magnetic fields; magnetisation reversal; nanostructured materials; perpendicular magnetic anisotropy
资金
- EU [NMP-FP7212257]
- RFBR [09-02-01423]
- National Science Foundation of the USA [ECCS 0653901]
- U.S. Army TARDEC [W56HZW-09-P-L564]
- IKERBASQUE
For a circular magnetic nanodot in a vortex ground state, we study how the critical velocity v(c) of the vortex core reversal depends on the magnitude H of a bias magnetic field applied perpendicularly to the dot plane. We find that, similarly to the case H=0, the critical velocity does not depend on the size of the dot. The critical velocity is dramatically reduced when the negative (i.e., opposite to the vortex core direction) bias field approaches the value, at which a static core reversal takes place. A simple analytical model shows good agreement with our numerical result.
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