Spin transport in antiferromagnetic NiO and magnetoresistance in Y3Fe5O12/NiO/Pt structures

Yu Ming Hung, Christian Hahn, Houchen Chang, Mingzhong Wu, Hendrik Ohldag, Andrew D. Kent

    Research output: Contribution to journalArticle

    Abstract

    We have studied spin transport and magnetoresistance in yttrium iron garnet (YIG)/NiO/Pt trilayers with varied NiO thickness. To characterize the spin transport through NiO we excite ferromagnetic resonance in YIG with a microwave frequency magnetic field and detect the voltage associated with the inverse spin-Hall effect (ISHE) in the Pt layer. The ISHE signal is found to decay exponentially with the NiO thickness with a characteristic decay length of 3.9 nm. This is contrasted with the magnetoresistance in these same structures. The symmetry of the magnetoresistive response is consistent with spin-Hall magnetoresistance (SMR). However, in contrast to the ISHE response, as the NiO thickness increases the SMR signal goes towards zero abruptly at a NiO thickness of ≃ 4 nm, highlighting the different length scales associated with the spin-transport in NiO and SMR in such trilayers.

    Original languageEnglish (US)
    Article number055903
    JournalAIP Advances
    Volume7
    Issue number5
    DOIs
    StatePublished - May 1 2017

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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    Hung, Y. M., Hahn, C., Chang, H., Wu, M., Ohldag, H., & Kent, A. D. (2017). Spin transport in antiferromagnetic NiO and magnetoresistance in Y3Fe5O12/NiO/Pt structures. AIP Advances, 7(5), [055903]. https://doi.org/10.1063/1.4972998