Tunable Sign Change of Spin Hall Magnetoresistance in Pt/NiO/YIG Structures

Dazhi Hou, Zhiyong Qiu, Joseph Barker, Koji Sato, Kei Yamamoto, Saül Vélez, Juan M. Gomez-Perez, Luis E. Hueso, Fèlix Casanova, Eiji Saitoh

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73 Citations (Scopus)

Abstract

Spin Hall magnetoresistance (SMR) has been investigated in Pt/NiO/YIG structures in a wide range of temperature and NiO thickness. The SMR shows a negative sign below a temperature that increases with the NiO thickness. This is contrary to a conventional SMR theory picture applied to the Pt/YIG bilayer, which always predicts a positive SMR. The negative SMR is found to persist even when NiO blocks the spin transmission between Pt and YIG, indicating it is governed by the spin current response of the NiO layer. We explain the negative SMR by the NiO "spin flop" coupled with YIG, which can be overridden at higher temperature by positive SMR contribution from YIG. This highlights the role of magnetic structure in antiferromagnets for transport of pure spin current in multilayers.

Original languageEnglish
Article number147202
JournalPhysical review letters
Volume118
Issue number14
DOIs
Publication statusPublished - 2017 Apr 3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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