Chirality Sensitive Domain Wall Motion in Spin-Orbit Coupled Ferromagnets

Abstract

Using the Lagrangian formalism, we solve analytically the equations of motion for current-induced domain-wall dynamics in a ferromagnet with Rashba spin-orbit coupling. An exact solution for the domain wall velocity is provided, including the effect of non-equilibrium conduction electron spin-density, Gilbert damping, and the Rashba interaction parameter. We demonstrate explicitly that the influence of spin-orbit interaction can be qualitatively different from the role of non-adiabatic spin-torque in the sense that the former is sensitive to the chirality of the domain wall whereas the latter is not: the domain wall velocity shows a reentrant behavior upon changing the chirality of the domain wall. This could be used to experimentally distinguish between the spin-orbit and non-adiabatic contribution to the wall speed. A quantitative estimate for the attainable domain wall velocity is given, based on an experimentally relevant set of parameters for the system.

7 pages, 2 figures. Accepted for publication in Phys. Rev. B

References in corpus (9)

• Phenomenology of Current-Induced Dynamics in Antiferromagnets
• High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy
• Current-induced domain wall motion in Rashba spin-orbit system
• Spin-transfer torques in anti-ferromagnetic metals from first principles
• Ab-initio GMR and current-induced torques in Au/Cr multilayers
• Inelastic scattering in ferromagnetic and antiferromagnetic metal spintronics
• Theory of Domain Wall Dynamics under Current
• Charge current driven by spin dynamics in disordered Rashba spin-orbit system
• Nonequilibrium critical dynamics with domain wall and surface

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• Spin-Orbit Torques in Two-Dimensional Rashba Ferromagnets
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• Improved Domain Wall Dynamics and Magnonic Torques using Topological Insulators
• Spin Orbit Torque in two dimensional Antiferromagnetic Topological Insulators
• How to construct the proper gauge-invariant density matrix in steady-state nonequilibrium: Applications to spin-transfer and spin-orbit torques
• Asymmetric Ferromagnetic Resonance, Universal Walker Breakdown, and Counterflow Domain Wall Motion in the Presence of Multiple Spin-Orbit Torques
• Birth, Growth and Death of an Antivortex during the Propagation of a Transverse Domain Wall in Magnetic Nanostrips
• Understanding current-driven dynamics of magnetic Néel walls in heavy metal/ferromagnetic metal/oxide trilayers
• Rashba induced chirality switching of domain walls and suppression of the Walker breakdown
• Anomalous domain wall velocity and Walker breakdown in hybrid systems with anisotropic exchange