Harmonic oscillator model for current- and field-driven magnetic vortices

Details Harmonic oscillator model for current- and field-driven magnetic vortices Harmonic oscillator model for current- and field-driven magnetic vortices

2007-10-02

arxiv.org/abs/0710.0532v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevB.76.224426

In experiments the distinction between spin-torque and Oersted-field driven magnetization dynamics is still an open problem. Here, the gyroscopic motion of current- and field-driven magnetic vortices in small thin-film elements is investigated by analytical calculations and by numerical simulations. It is found that for small harmonic excitations the vortex core performs an elliptical rotation around its equilibrium position. The global phase of the rotation and the ratio between the semi-axes are determined by the frequency and the amplitude of the Oersted field and the spin torque.

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