Current-Induced Resonant Motion of a Magnetic Vortex Core: Effect of Nonadiabatic Spin Torque

Abstract

The current-induced resonant excitation of a magnetic vortex core is investigated by means of analytical and micromagnetic calculations. We find that the radius and the phase shift of the resonant motion are not correctly described by the analytical equations because of the dynamic distortion of a vortex core. In contrast, the initial tilting angle of a vortex core is free from the distortion and determined by the nonadiabaticity of the spin torque. It is insensitive to experimentally uncontrollable current-induced in-plane Oersted field. We propose that a time-resolved imaging of the very initial trajectory of a core is essential to experimentally estimate the nonadiabaticity.

4 pages, 4 figures

References in corpus (16)

• Roles of non-equilibrium conduction electrons on magnetization dynamics of ferromagnets
• Micromagnetic understanding of current-driven domain wall motion in patterned nanowires
• Theory of Current-Driven Domain Wall Motion: A Poorman's Approach
• Current-spin coupling for ferromagnetic domain walls in fine wires
• Current-driven resonant excitation of magnetic vortex
• Current-induced domain wall motion in a nanowire with perpendicular magnetic anisotropy
• Spin Transfer Torque for Continuously Variable Magnetization
• Microscopic Calculation of Spin Torques in Disordered Ferromagnets
• Current-induced magnetization dynamics in disordered itinerant ferromagnets
• Time-Resolved X-ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration
• Current-induced Vortex Motion by Spin-Transfer Torque
• Threshold Current of Domain Wall Motion under Extrinsic Pinning, $\beta$-Term and Non-Adiabaticity
• Current-driven vortex domain wall dynamics by micromagnetic simulations
• Harmonic oscillator model for current- and field-driven magnetic vortices
• Adiabatic Domain Wall Motion and Landau-Lifshitz Damping
• Effects of current on vortex and transverse domain walls

Cited by in corpus (2)

• Spin Hall Effect-driven Spin Torque in Magnetic Texture
• In-Situ Contacting and Current-Injection into Samples in Photoemission Electron Microscopes