Spin-Transfer Torques in Helimagnets

Abstract

We theoretically investigate current-induced magnetization dynamics in chiral-lattice helimagnets. Spin-orbit coupling in non-centrosymmetric crystals induces a reactive spin-transfer torque that has not been previously considered. We demonstrate how the torque is governed by the crystal symmetry and acts as an effective magnetic field along the current direction in cubic B20-type crystals. The effects of the new torque are computed for current-induced dynamics of spin-spirals and the Doppler shift of spin waves. In current-induced spin-spiral motion, the new torque tilts the spiral structure. The spin waves of the spiral structure are initially displaced by the new torque, while the dispersion relation is unaffected.

Final version accepted by Physical Review B

References in corpus (5)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Spin Transfer Torques
• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Electron Transport Driven by Nonequilibrium Magnetic Textures
• Spin waves in a skyrmion crystal

Cited by in corpus (11)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Current-Driven Dynamics of Magnetic Hopfions
• Berry phase theory of Dzyaloshinskii-Moriya interaction and spin-orbit torques
• Phenomenology of current-skyrmion interactions in thin films with perpendicular magnetic anisotropy
• Spin-Motive Forces and Current-Induced Torques in Ferromagnets
• Intrinsic and extrinsic tunability of Rashba spin-orbit coupled emergent inductors
• Spin-Orbit Torques and Anisotropic Magnetization Damping in Skyrmion Crystals
• Combing the helical phase of chiral magnets with electric currents
• Supercurrent-induced Skyrmion dynamics and Tunable Weyl points in Chiral Magnet with Superconductivity
• Voltage induced conversion of helical to uniform nuclear spin polarization in a quantum wire
• Emergent impedance due to antiferromagnetic domain wall dynamics