Effect of magnons on the temperature dependence and anisotropy of spin-orbit torque

Abstract

We investigate the influence of magnons on the temperature-dependence and the anisotropy of the spin-orbit torque (SOT). For this purpose we use 3rd order perturbation theory in the framework of the Keldysh formalism in order to derive suitable equations to compute the magnonic SOT. We find several contributions to the magnonic SOT, which depend differently on the spin-wave stiffness $\mathcal{A}$ and on the temperature $T$, with the dominating contribution scaling like $T^2/{\mathcal{A}}^2$. Based on this formalism we compute the magnonic SOT in the ferromagnetic Rashba model. For large Rashba parameters the magnonic SOT is strongly anisotropic and for small quasiparticle broadening it may become larger than the non-magnonic SOT.

References in corpus (8)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Angular and temperature dependence of current induced spin-orbit effective fields in Ta/CoFeB/MgO nanowires
• On the origin of field-like spin-orbit torques in heavy metal-ferromagnet-oxide thin film heterostructures
• First-principles calculation of spin-orbit torque in a Co/Pt bilayer
• First Principles Study of Angular Dependence of Spin-Orbit Torque in Pt/Co and Pd/Co Bilayers
• Calculations of spin-disorder resistivity from first principles
• Engineering the dynamics of topological spin textures by anisotropic spin-orbit torques
• Spin-wave-induced correction to the conductivity of ferromagnets

Cited by in corpus (1)

• Construction of the spectral function from non-commuting spectral moment matrices