Dynamic Origin of Vortex Core Switching in Soft Magnetic Nanodots

Details Dynamic Origin of Vortex Core Switching in Soft Magnetic Nanodots Dynamic Origin of Vortex Core Switching in Soft Magnetic Nanodots

2007-08-10

arxiv.org/abs/0708.1359v1

Phys. Rev. Lett. 100, 027203 (2008)

Physics

Condensed Matter

Materials Science

17 pages and 3 figures

Scientific paper

10.1103/PhysRevLett.100.027203

The magnetic vortex with the in-plane curling magnetization and the out-of-plane magnetization at the core is a unique ground state in nanoscale magnetic elements. This kind of magnetic vortex can be used as a memory unit for information storage, through its downward or upward core-orientation and, thus, controllable core switching deserves some special attention. Our analytical and micromagnetic calculations reveal that the origin of the vortex core reversal is a gyrotropic field. This field is induced by vortex dynamic motion and is proportional to the velocity of the moving vortex. Our calculations elucidate the physical origin of the vortex core dynamic reversal and offer a key to effective manipulation of the vortex-core orientation.

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