title: Physical origins of the new magnetoresistance in Pt/YIG.
abstract: 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.
authors: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA and National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
authors: B F
authors: BF
authors: Miao
authors: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors: S Y
authors: SY
authors: Huang
authors: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors: D
authors: D
authors: Qu
authors: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors: C L
authors: CL
authors: Chien