Enhancement of the anti-damping spin torque efficacy of platinum by interface modification

被引：114

作者：

Minh-Hai Nguyen ^{[1
]}

Pai, Chi-Feng ^{[1
]}

Nguyen, Kayla X. ^{[1
]}

Muller, David A. ^{[1
,2
]}

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

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

机构：

[1] Cornell Univ, Ithaca, NY 14853 USA

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

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 22期

关键词：

DOMAIN-WALLS; DEVICES; DRIVEN; LOGIC;

D O I：

10.1063/1.4922084

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report a strong enhancement of the efficacy of the spin Hall effect (SHE) of Pt for exerting anti-damping spin torque on an adjacent ferromagnetic layer by the insertion of approximate to 0.5 nm layer of Hf between a Pt film and a thin, <= 2 nm, Fe60Co20B20 ferromagnetic layer. This enhancement is quantified by measurement of the switching current density when the ferromagnetic layer is the free electrode in a magnetic tunnel junction. The results are explained as the suppression of spin pumping through a substantial decrease in the effective spin-mixing conductance of the interface, but without a concomitant reduction of the ferromagnet's absorption of the SHE generated spin current. (C) 2015 AIP Publishing LLC.

引用

页数：5