Physical Origins of the New Magnetoresistance in Pt/YIG
Physical Origins of the New Magnetoresistance in Pt/YIG
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DOI：
10.1103/physrevlett.112.236601
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发表时间：
2014-06-09
影响因子：
8.6
通讯作者：
Chien, C. L.
中科院分区：
文献类型：
--
作者：
Miao, B. F.;Huang, S. Y.;Chien, C. L.
在Pt/YIG中，当名义上的Pt与亚铁磁绝缘体钇铁石榴石（YIG）接触时，观察到一种新型的磁电阻效应，引起了实验和理论上的极大兴趣。在这封信中，我们实验证明了两个物理起源的新的MR：自旋电流在Pt/YIG界面和磁邻近效应。新的MR也可以复制时，Pt是在与掺杂有百分之几的Fe杂质的超导绝缘体接触。通过调整YIG表面并在Pt和YIG之间插入Au层，我们能够分离这两种贡献。
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.