Spin-orbit torque in a Ni-Fe single layer

被引：37

作者：

Seki, Takeshi ^{[1
,2
]}

Lau, Yong-Chang ^{[1
,2
]}

Iihama, Satoshi ^{[2
,3
,5
]}

Takanashi, Koki ^{[1
,2
,4
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan

[4] Tohoku Univ, Ctr Sci & Innovat Spintron, Core Res Cluster, Sendai, Miyagi 9808577, Japan

[5] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

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

关键词：

Ferromagnetic materials - Ferromagnetic resonance - Nickel alloys - Ferromagnetism - Iron alloys - Binary alloys;

D O I：

10.1103/PhysRevB.104.094430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We evaluated the self-induced spin-orbit torque (SOT) in a single ferromagnetic layer. Spin-torque ferromagnetic resonance (ST-FMR) was measured for the very thin Ni-Fe (permalloy, Py) layers with and without structural inversion symmetry: asymmetric and symmetric Py layers. For both structures, the fieldlike component coming from the Oersted field clearly appeared. On the other hand, the dampinglike component was observed only for asymmetric Py with thickness <= 3 nm. This dampinglike torque is attributable to the significant spatial change in the properties of Py. We propose a toy model to analyze the self-induced SOT.

引用

页数：9

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