Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers

doi:10.1088/1674-1056/25/7/077501

Abstract

The interplay of the Rashba effect and the spin Hall effect originating from current induced spin-orbit coupling was investigated in the as-deposited and annealed Pt/Co/MgO stacks with perpendicular magnetic anisotropy. The above two effects were analyzed based on Hall measurements under external magnetic fields longitudinal and vertical to dc current, respectively. The coercive field as a function of dc current in vertical mode with only the Rashba effect involved decreases due to thermal annealing. Meanwhile, spin orbit torques calculated from Hall resistance with only the spin Hall effect involved in the longitudinal mode decrease in the annealed sample. The experimental results prove that the bottom Pt/Co interface rather than the Co/MgO top one plays a more critical role in both Rashba effect and spin Hall effect.

Keywords: spin Hall effect Rashba effect perpendicular multilayers

Received: 07 March 2016
Revised: 13 April 2016
Accepted manuscript online:

PACS:	75.40.Gb	(Dynamic properties?)
	75.70.Tj	(Spin-orbit effects)
	75.70.-i	(Magnetic properties of thin films, surfaces, and interfaces)

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2015CB921401), the National Natural Science Foundation of China (Grant Nos. 51331002, 51371027, 51431009, 51471183, and 11274371), the National Instrumentation Program of China (Grant No. 2012YQ120048), and the Instrument Development Program of Chinese Academy of Sciences (Grant No. YZ201345).

Corresponding Authors: Shou-Guo Wang, Guang-Hua Yu
E-mail: sgwang@ustb.edu.cn;ghyu@mater.ustb.edu.cn

Cite this article:

Yun-Chi Zhao(赵云驰), Guang Yang(杨光), Bo-Wen Dong(董博闻), Shou-Guo Wang(王守国), Chao Wang(王超), Young Sun(孙阳), Jing-Yan Zhang(张静言), Guang-Hua Yu(于广华) Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers 2016 Chin. Phys. B 25 077501

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Interplay of Rashba effect and spin Hall effect in perpendicular Pt/Co/MgO magnetic multilayers

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