Influence of spin-transfer torque on thermally activated ferromagnetic resonance excitations in magnetic tunnel junctions

被引：39

作者：

Petit, S. ^{[1
,2
]}

de Mestier, N. ^{[1
,2
]}

Baraduc, C. ^{[1
,2
]}

Thirion, C. ^{[1
,2
]}

Liu, Y. ^{[3
]}

Li, M. ^{[3
]}

Wang, P. ^{[3
]}

Dieny, B. ^{[1
,2
]}

机构：

[1] Univ Grenoble 1, CEA CNRS INPG, SPINTEC, F-38054 Grenoble, France

[2] CEA INAC, F-38054 Grenoble, France

[3] Headway Technol, Milpitas, CA 95035 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.78.184420

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Voltage noise measurements on magnetic tunnel junctions show that thermal fluctuations of the magnetization are either amplified or quenched by subcritical spin-transfer torque depending on the current direction. We present an analytical model that describes the dependence of thermally activated ferromagnetic resonance on bias current. The evolution of the peak amplitude and linewidth with the applied current is directly related to the longitudinal torque, whereas the shift of the resonance frequency is sensitive to the transverse torque. Both spin torque terms are independently extracted from the measured noise spectra. Our results support the general idea that it is more pertinent to describe spin torque in terms of voltage rather than current in magnetic tunnel junctions.

引用

页数：13

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