Chiral skyrmions in an anisotropy gradient driven by spin-Hall effect
arXiv:1803.04160 · doi:10.1103/PhysRevB.98.024421
Abstract
A strategy to drive skyrmion motion by a combination of an anisotropy gradient and spin Hall effect has recently been demonstrated. Here, we study the fundamental properties of this type of motion by combining micromagnetic simulations and a generalized Thiele equation. We find that the anisotropy gradient drives the skyrmion mainly along the direction perpendicular to the gradient, due to the conservative part of the torque. There is some slower motion along the direction parallel to the anisotropy gradient due to damping torque. When an appropriate spin Hall torque is added, the skyrmion velocity in the direction of the anisotropy gradient can be enhanced. This motion gives rise to acceleration of the skyrmion as this moves to regions of varying anisotropy. This phenomenon should be taken into account in experiments for the correct evaluation of the skyrmion velocity. We employ a Thiele like formalism and derive expressions for the velocity and the acceleration of the skyrmion that match very well with micromagnetic simulation results.
References in corpus (25)
- Spin Hall effect
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Magnetic switching by spin torque from the spin Hall effect
- Observation of room temperature magnetic skyrmions and their current-driven dynamics in ultrathin Co films
- Topological Hall effect in the A-phase of MnSi
- Blowing Magnetic Skyrmion Bubbles
- Roles of non-equilibrium conduction electrons on magnetization dynamics of ferromagnets
- Direct Observation of the Skyrmion Hall Effect
- Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
- Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
- Room temperature chiral magnetic skyrmion in ultrathin magnetic nanostructures
- Skyrmion confinement in ultrathin film nanostructures in the presence of Dzyaloshinskii-Moriya interaction
- Current-induced skyrmion dynamics in constricted geometries
- Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
- Magnetic skyrmion logic gates: conversion, duplication and merging of skyrmions
- Discovery of Magnetic Antiskyrmions Beyond Room Temperature in Tetragonal Heusler Materials
- Field-Dependent Size and Shape of Single Magnetic Skyrmions
- Particle model for skyrmions in metallic chiral magnets: dynamics, pinning and creep
- Field-free deterministic ultra fast creation of skyrmions by spin orbit torques
- Potential implementation of Reservoir Computing models based on magnetic skyrmions
- Current-driven skyrmion dynamics in disordered films
- Skyrmion based microwave detectors and harvesting
- Origin of temperature and field dependence of magnetic skyrmion size in ultrathin nanodots
- Multiplet of skyrmion states on a curvilinear defect: skyrmion lattices as a ground state
- Fluctuations and Noise Signatures of Driven Magnetic Skyrmions
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- Ultrafast domain wall motion in ferrimagnets induced by magnetic anisotropy gradient
- Curvature induced drift and deformation of magnetic skyrmions: comparison of ferro- and antiferromagnetic cases
- Spin-wave-driven skyrmion dynamics in ferrimagnets: Effect of net angular momentum
- Skyrmion motion in magnetic anisotropy gradients: Acceleration caused by deformation
- The skyrmion bags in an anisotropy gradient
- Current-induced H-shaped-skyrmion creation and their dynamics in the helical phase
- Circular motion of non-collinear spin textures in Corbino disks: Dynamics of Néel- versus Bloch-type skyrmions and skyrmioniums
- Driving skyrmions with low threshold current density in Pt/CoFeB thin film
- Alignment induced re-configurable walls for patterning and assembly of liquid crystal skyrmions
- Suppression of the skyrmion Hall effect in synthetic ferrimagnets with gradient magnetization
- Skyrmion Dynamics and Transverse Mobility: Skyrmion Hall Angle Reversal on 2D Periodic Substrates with dc and Biharmonic ac Drives
- Propagating magnetic droplet solitons as moveable nanoscale spin-wave sources with tunable direction of emission
- Stabilization and helicity control of hybrid magnetic skyrmion