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 (10)

• Roles of non-equilibrium conduction electrons on magnetization dynamics of ferromagnets
• Micromagnetic understanding of current-driven domain wall motion in patterned nanowires
• Electrical switching of vortex core in a magnetic disk
• Magnetic Vortex Core Dynamics in a Ferromagnetic Dot
• Current-driven resonant excitation of magnetic vortex
• Vortex state oscillations in soft magnetic cylindrical dots
• Current-induced Vortex Motion by Spin-Transfer Torque
• 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
• Current-Driven Domain-Wall Dynamics in Curved Ferromagnetic Nanowires

Cited by in corpus (20)

• Inertia and chiral edge modes of a skyrmion magnetic bubble
• Vortex oscillations induced by a spin-polarized current in a magnetic nanopillar: Evidence for a failure of the Thiele approach
• 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
• Few-nm tracking of magnetic vortex orbits and their decay with ultrafast Lorentz microscopy
• Two Circular-Rotational Eigenmodes in Vortex Gyrotropic Motions in Soft Magnetic Nanodots
• Current-driven and field-driven domain walls at nonzero temperature
• Quantitative understanding of magnetic vortex oscillations driven by spin-polarized out-of-plane dc current: Analytical and micromagnetic numerical study
• Electric spectroscopy of vortex states and dynamics in magnetic disks
• Proposal of a robust measurement scheme for the non-adiabatic spin torque using the displacement of magnetic vortices
• Current- and field-driven magnetic antivortices
• Effective damping enhancement in noncollinear spin structures
• Three-dimensional Resonant Magnetization Dynamics Unraveled by Time-Resolved Soft X-ray Laminography
• Strong coupling of a single photon to a magnetic vortex
• Control of the gyration dynamics of magnetic vortices by the magnetoelastic effect
• Spin motive forces due to magnetic vortices and domain walls
• Current-Induced Resonant Motion of a Magnetic Vortex Core: Effect of Nonadiabatic Spin Torque
• Large amplitude vortex gyration in Permalloy/Bi${}_2$Se${}_3$-like heterostructures
• Coercivity reduction in a two-dimensional array of nanoparticles
• Probing the spin polarization of current by soft X-ray imaging of current-induced magnetic vortex dynamics