Magnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractIn thin magnetic layers with structural inversion asymmetry and spin-orbit coupling, the Dzyaloshinskii-Moriya interaction arises at the interface. When a spin-wave current jm flows in a system with a homogeneous magnetization m, this interaction produces an effective fieldlike torque of the form TFLm×(z×jm) as well as a dampinglike torque, TDLm×[(z×jm)×m], the latter only in the presence of spin-wave relaxation (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.
CitationMagnon-mediated Dzyaloshinskii-Moriya torque in homogeneous ferromagnets 2014, 90 (22) Physical Review B
PublisherAmerican Physical Society (APS)
JournalPhysical Review B