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.
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页数：5
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