Spin-independent transparency of pure spin current at normal/ferromagnetic metal interface

doi:10.1088/1674-1056/27/3/037202

Abstract

The spin transparency at the normal/ferromagnetic metal (NM/FM) interface was studied in Pt/YIG/Cu/FM multilayers. The spin current generated by the spin Hall effect (SHE) in Pt flows into Cu/FM due to magnetic insulator YIG blocking charge current and transmitting spin current via the magnon current. Therefore, the nonlocal voltage induced by an inverse spin Hall effect (ISHE) in FM can be detected. With the magnetization of FM parallel or antiparallel to the spin polarization of pure spin currents (σ_sc), the spin-independent nonlocal voltage is induced. This indicates that the spin transparency at the Cu/FM interface is spin-independent, which demonstrates that the influence of spin-dependent electrochemical potential due to spin accumulation on the interfacial spin transparency is negligible. Furthermore, a larger spin Hall angle of Fe₂₀Ni₈₀ (Py) than that of Ni is obtained from the nonlocal voltage measurements.

Keywords: spin transparency spin current magnetic insulator inverse Hall effect

Received: 28 September 2017
Revised: 14 December 2017
Accepted manuscript online:

PACS:	72.25.Mk	(Spin transport through interfaces)
	72.25.Rb	(Spin relaxation and scattering)
	72.25.-b	(Spin polarized transport)
	75.70.Cn	(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2015CB921502), the National Natural Science Foundation of China (Grant Nos. 11474184 and 11627805), the 111 Project, China (Grant No. B13029), and the Fundamental Research Funds of Shandong University, China.

Corresponding Authors: Shishou Kang
E-mail: skang@sdu.edu.cn

Cite this article:

Runrun Hao(郝润润), Hai Zhong(钟海), Yun Kang(康韵), Yufei Tian(田雨霏), Shishen Yan(颜世申), Guolei Liu(刘国磊), Guangbing Han(韩广兵), Shuyun Yu(于淑云), Liangmo Mei(梅良模), Shishou Kang(康仕寿) Spin-independent transparency of pure spin current at normal/ferromagnetic metal interface 2018 Chin. Phys. B 27 037202

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