Microscopic calculation of thermally-induced spin-transfer torques

Abstract

Spin-transfer torques induced by temperature gradients in conducting ferromagnets are calculated microscopically for smooth magnetization textures. Temperature gradients are treated a la Luttinger by introducing a fictitious gravitational field that couples to the energy density. The thermal torque coefficients obtained by the Kubo formula contain divergences caused by equilibrium components that should be subtracted before applying the Einstein-Luttinger relation. Only by following this procedure a familiar Mott-like formula is obtained for the dissipative spin-transfer torque. The result indicates that a fictitious field coupled to the entropy rather than energy would solve the issue from the outset.

11 pages, 2 figures

References in corpus (9)

• Microscopic approach to current-driven domain wall dynamics
• Thermal Spin-Transfer Torques in Magnetoelectronic Devices
• Microscopic Calculation of Spin Torques in Disordered Ferromagnets
• Berry phase theory of Dzyaloshinskii-Moriya interaction and spin-orbit torques
• Functional Keldysh Theory of Spin Torques
• Thermal vector potential theory of transport induced by temperature gradient
• Giant thermal spin torque assisted magnetic tunnel junction switching
• Skyrmionic spin Seebeck effect via dissipative thermomagnonic torques
• Thermoelectric spin transfer in textured magnets

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• Geometrical contributions to the exchange constants: Free electrons with spin-orbit interaction
• Microscopic theory of magnon-drag electron flow in ferromagnetic metals
• Thermally-induced spin polarization in a magnetized two-dimensional electron gas with Rashba spin-orbit interaction
• Theory of Cross-correlated Electron-Magnon Transport Phenomena: Case of Magnetic Topological Insulator
• Seebeck effect of Dirac electrons
• Microscopic theory of spin Nernst effect
• Spin accumulation in the spin Nernst effect
• Quantum transport phenomena induced by time-dependent fields