Physical Origins of the New Magnetoresistance in Pt/YIG

被引：119

作者：

Miao, B. F. ^{[1
,2
,3
]}

Huang, S. Y. ^{[1
]}

Qu, D. ^{[1
]}

Chien, C. L. ^{[1
]}

机构：

[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 23期

基金：

美国国家科学基金会;

关键词：

Magnetoresistance;

D O I：

10.1103/PhysRevLett.112.236601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new type of magnetoresistance (MR) observed in Pt/YIG when nominally nonmagnetic Pt comes in contact with a ferrimagnetic insulator yttrium iron garnet (YIG) has drawn intense experimental and theoretical interest. In this Letter, we experimentally demonstrate two physical origins of the new MR: a spin current across the Pt/YIG interface and the magnetic proximity effect. The new MR can also be reproduced when Pt is in contact with a nonmagnetic insulator doped with a few percent of Fe impurities. By tuning the YIG surface and inserting an Au layer between the Pt and YIG, we are able to separate the two contributions.

引用

页数：5

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