Quantitative characterization of the spin-orbit torque using harmonic Hall voltage measurements

被引：464

作者：

Hayashi, Masamitsu ^{[1
]}

Kim, Junyeon ^{[1
]}

Yamanouchi, Michihiko ^{[2
,3
]}

Ohno, Hideo ^{[2
,3
,4
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[2] Tohoku Univ, Ctr Spintron Integrated Syst, Sendai, Miyagi 9808577, Japan

[3] Tohoku Univ, Elect Commun Res Inst, Sendai, Miyagi 9808577, Japan

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

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 14期

关键词：

MAGNETIC TUNNEL-JUNCTIONS; EFFECTIVE-FIELD; DOMAIN-WALLS; MGO; DEPENDENCE; DYNAMICS; LAYER; MULTILAYERS; ELECTRONS; VECTOR;

D O I：

10.1103/PhysRevB.89.144425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Solid understanding of current induced torques is a key to the development of current and voltage controlled magnetization dynamics in ultrathin magnetic heterostructures. To evaluate the size and direction of such torques, or effective fields, a number of methods have been employed. Here, we examine the adiabatic (low-frequency) harmonic Hall voltage measurement that has been used to study the effective field. We derive an analytical formula for the harmonic Hall voltages to evaluate the effective field for both out of plane and in-plane magnetized systems. The formula agrees with numerical calculations based on a macrospin model. Two different in-plane magnetized films, Pt|CoFeB|MgO and CuIr|CoFeB|MgO are studied using the formula developed. The effective field obtained for the latter system shows relatively good agreement with that estimated using spin torque switching phase diagram measurements reported previously. Our results illustrate the versatile applicability of harmonic Hall voltage measurement for studying current induced torques in magnetic heterostructures.

引用

页数：15

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