Magnon-Mediated Dzyaloshinskii-Moriya Torque in Homogeneous Ferromagnets

Abstract

In thin magnetic layers with structural inversion asymmetry and spin-orbit coupling, a Dzyaloshinskii-Moriya interaction arises at the interface. When a spin wave current ${\mathbf{j}}_m$ flows in a system with a homogeneous magnetization {\bf m}, this interaction produces an effective field-like torque on the form ${\mathbf{T}}_{\mathrm{FL}}\propto \mathbf{m}\times (\mathbf{z}\times {\mathbf{j}}_m)$ as well as a damping-like torque, ${\mathbf{T}}_{\mathrm{DL}}\propto \mathbf{m}\times [(\mathbf{z}\times {\mathbf{j}}_m)\times \mathbf{m}]$ in the presence of spin-wave relaxation ($\mathbf{z}$ is normal to the interface). These torques mediated by the magnon flow can reorient the time-averaged magnetization direction and display a number of similarities with the torques arising from the electron flow in a magnetic two dimensional electron gas with Rashba spin-orbit coupling. This magnon-mediated spin-orbit torque can be efficient in the case of magnons driven by a thermal gradient.

5 pages, 3 figures

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• Dirac Spin-Orbit Torques at the Surface of Topological Insulators
• Spin torque and Nernst effects in Dzyaloshinskii-Moriya ferromagnets
• Magnon dispersion shift in the induced-ferromagnetic phase of the noncentrosymmetric MnSi
• Orbital Magnetic Moment of Magnons
• Phenomenology of chiral damping in noncentrosymmetric magnets
• Generation of single skyrmions by picosecond magnetic field pulses
• Electric field control of magnon-induced magnetization dynamics in multiferroics
• Spin-wave propagation in the presence of inhomogeneous Dzyaloshinskii-Moriya interactions
• Magnon Planar Hall Effect and Anisotropic Magnetoresistance in a Magnetic Insulator
• Dirac electrons and domain walls: a realization in junctions of ferromagnets and topological insulators
• Thermally induced magnonic spin current, thermomagnonic torques and domain wall dynamics in the presence of Dzyaloshinskii-Moriya interaction
• Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators
• The inverse thermal spin-orbit torque and the relation of the Dzyaloshinskii-Moriya interaction to ground-state energy currents
• Unidirectional Magnon-Driven Domain Wall Motion Due to the Interfacial Dzyaloshinskii-Moriya Interaction
• Pumping of magnons in a Dzyaloshinskii-Moriya ferromagnet
• Magnetization pumping and dynamics in a Dzyaloshinskii-Moriya magnet
• Anatomy of spin wave driven magnetic texture motion via magnonic torques
• Vector spin Seebeck effect and spin swapping effect in antiferromagnetic insulators with non-collinear spin structure
• Thermal Spin-Orbit Torque in Spintronics
• Band topology and dynamic multiferroicity induced from dynamical Dzyaloshinskii-Moriya interactions in centrosymmetric lattices