Central role of domain wall depinning for perpendicular magnetization switching driven by spin torque from the spin Hall effect

被引：240

作者：

Lee, O. J. ^{[1
]}

Liu, L. Q. ^{[1
]}

Pai, C. F. ^{[1
]}

Li, Y. ^{[1
]}

Tseng, H. W. ^{[1
]}

Gowtham, P. G. ^{[1
]}

Park, J. P. ^{[1
]}

Ralph, D. C. ^{[1
,2
]}

Buhrman, R. A. ^{[1
]}

机构：

[1] Cornell Univ, Ithaca, NY 14853 USA

[2] Cornell Univ, Kavli Inst, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 02期

关键词：

DYNAMICS; COBALT;

D O I：

10.1103/PhysRevB.89.024418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study deterministic magnetic reversal of a perpendicularly magnetized Co layer in a Co/MgO/Ta nanosquare driven by spin Hall torque from an in-plane current flowing in an underlying Pt layer. The rate-limiting step of the switching process is domain wall (DW) depinning by spin Hall torque via a thermally assisted mechanism that eventually produces full reversal by domain expansion. An in-plane applied magnetic field collinear with the current is required, with the necessary field scale set by the need to overcome DW chirality imposed by the Dzyaloshinskii-Moriya interaction. Once Joule heating is taken into account the switching current density is quantitatively consistent with a spin Hall angle theta(SH) approximate to 0.07 for 4 nm of Pt.

引用

页数：8

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