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

被引：2

作者：

Freimuth, Frank ^{[1
,2
,3
,4
]}

Bluegel, Stefan ^{[1
,2
,3
]}

Mokrousov, Yuriy ^{[1
,2
,3
,4
]}

机构：

[1] Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[3] JARA, D-52425 Julich, Germany

[4] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

来源：

PHYSICAL REVIEW B | 2021年 / 104卷 / 09期

关键词：

28;

D O I：

10.1103/PhysRevB.104.094434

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the influence of magnons on the temperature dependence and the anisotropy of the spin-orbit torque (SOT). For this purpose, we use third-order perturbation theory in the framework of the Keldysh formalism 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 A and the temperature T, with the dominating contribution scaling like T-2/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 nonmagnonic SOT.

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页数：14

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