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arXiv 1401.0883cond-mat.mes-hallcond-mat.mtrl-sci
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均匀铁磁体中磁振子介导的Dzyaloshinskiii-Moriya力矩

Magnon-Mediated Dzyaloshinskii-Moriya Torque in Homogeneous Ferromagnets

Aurelien Manchon, P. Birame Ndiaye, Jung-Hwan Moon, Hyun-Woo Lee, Kyung-Jin Lee

备注：
5 pages, 3 figures
发表信息：
Phys. Rev. B 90, 224403 (2014)
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摘要：

在具有结构反转不对称性和自旋轨道耦合的薄磁性层中，在界面处产生Dzyaloshinskiii-Moriya相互作用。当自旋波电流${\bf j}_m$在具有均匀磁化{ \bf m}的系统中流动时，这种相互作用在形式${\bf T}_{\rm FL}\propto{\bf m}\times({\bf z}\times{\bf j}_m)$上产生有效的类场转矩以及在存在自旋波弛豫的情况下的类阻尼转矩${\bf T}_{\rm DL}\propto{\bf m}\times[({\bf z}\times{\bf j}_m)\times{\bf m}]$（${\bf z}$垂直于界面）。这些力矩介导的磁振子流可以重新定向的时间平均磁化方向，并显示了一些相似之处所产生的转矩从电子流在磁性的二维电子气与Rashba自旋轨道耦合。这种磁振子介导的自旋轨道力矩在磁振子由热梯度驱动的情况下是有效的。

英文摘要：

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 ${\bf j}_m$ flows in a system with a homogeneous magnetization {\bf m}, this interaction produces an effective field-like torque on the form ${\bf T}_{\rm FL}\propto{\bf m}\times({\bf z}\times{\bf j}_m)$ as well as a damping-like torque, ${\bf T}_{\rm DL}\propto{\bf m}\times[({\bf z}\times{\bf j}_m)\times{\bf m}]$ in the presence of spin-wave relaxation (${\bf z}$ 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.

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