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

Abstract

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.

References in corpus (3)

• Current-driven resonant excitation of magnetic vortex
• Current-driven vortex domain wall dynamics by micromagnetic simulations
• Spin wave dynamics and the determination of intrinsic Gilbert damping in locally-excited Permalloy thin films

Cited by in corpus (6)

• Time-Resolved X-ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration
• Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots
• Two Circular-Rotational Eigenmodes in Vortex Gyrotropic Motions in Soft Magnetic Nanodots
• Current- and field-driven magnetic antivortices
• Current-Induced Resonant Motion of a Magnetic Vortex Core: Effect of Nonadiabatic Spin Torque
• Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics