Current-induced Vortex Motion by Spin-Transfer Torque

Details Current-induced Vortex Motion by Spin-Transfer Torque Current-induced Vortex Motion by Spin-Transfer Torque

2005-08-25

arxiv.org/abs/cond-mat/0508599v1

Phys. Rev. B 73, 020403(R) (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.73.020403

We investigate the dynamics of a magnetic vortex driven by spin-transfer torque due to spin current in the adiabatic case. The vortex core represented by collective coordinate experiences a transverse force proportional to the product of spin current and gyrovector, which can be interpreted as the geometric force determined by topological charges. We show that this force is just a reaction force of Lorentz-type force from the spin current of conduction electrons. Based on our analyses, we propose analytically and numerically a possible experiment to check the vortex displacement by spin current in the case of single magnetic nanodot.

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