Interfacial coupling and negative spin Hall magnetoresistance in Pt/NiO/YIG

被引：19
|
作者：
Luan, Z. Z. [1 ,2 ]
Chang, F. F. [3 ,4 ,5 ]
Wang, P. [1 ,2 ]
Zhou, L. F. [1 ,2 ]
Cooper, J. F. K. [6 ]
Kinane, C. J. [6 ]
Langridge, S. [6 ]
Cai, J. W. [3 ,4 ]
Du, J. [1 ,2 ]
Zhu, T. [3 ,4 ]
Wu, D. [1 ,2 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Dept Phys, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China
[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[4] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[5] Dongguan Neutron Sci Ctr, Dongguan 523803, Peoples R China
[6] Rutherford Appleton Lab, ISIS Neutron & Muon Source, Harwell Campus, Didcot OX11 0QX, Oxon, England
来源：
APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 07期
基金：
中国国家自然科学基金;
关键词：
MAGNETIZATION; REFLECTIVITY; COO;
D O I：
10.1063/1.5041865
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Inserting an antiferromagnetic layer of NiO between Pt and Y3Fe5O12 (YIG) changes the positive sign of the spin Hall magnetoresistance (SMR) in Pt/YIG to a negative sign at low temperature. Here, we use polarized neutron reflectometry to explore the coupling between NiO and YIG to understand the mechanism of the negative SMR. A weak uncompensated magnetic moment is observed in the NiO and the direction of this moment is perpendicular to YIG. Therefore, we infer that the spin axis of NiO is perpendicular to YIG. This result directly supports the explanation that the negative SMR results from the pure spin current reflected back by the NiO layer and the spin-flop coupling between NiO and YIG. Published by AIP Publishing.
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页数：4
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