Spin-Transfer-Torque-Assisted Domain-Wall Creep in a Co/Pt Multilayer Wire

被引：71

作者：

Alvarez, L. San Emeterio ^{[1
]}

Wang, K. -Y. ^{[2
]}

Lepadatu, S. ^{[1
]}

Landi, S. ^{[3
]}

Bending, S. J. ^{[3
]}

Marrows, C. H. ^{[1
]}

机构：

[1] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[2] Hitachi Cambridge Lab, Cambridge CB3 0HE, England

[3] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

基金：

英国工程与自然科学研究理事会;

关键词：

MOTION; PROPAGATION; NANOWIRES;

D O I：

10.1103/PhysRevLett.104.137205

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied field-and current-driven domain-wall (DW) creep motion in a perpendicularly magnetized Co/Pt multilayer wire by real-time Kerr microscopy. The application of a dc current of density of less than or similar to 10(7) A/cm(2) assisted only the DW creeping under field in the same direction as the electron flow, a signature of spin-transfer torque effects. We develop a model dealing with both bidirectional spin-transfer effects and Joule heating, with the same dynamical exponent mu = 1/4 for both field-and current-driven creep, and use it to quantify the spin-transfer efficiency as 3.6 +/- 0.6 Oe cm(2)/MA in our wires, confirming the significant nonadiabatic contribution to the spin torque.

引用

页数：4

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