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Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers

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  • Junxue Li

    (University of California)

  • Yadong Xu

    (University of California)

  • Mohammed Aldosary

    (University of California)

  • Chi Tang

    (University of California)

  • Zhisheng Lin

    (University of California)

  • Shufeng Zhang

    (University of Arizona)

  • Roger Lake

    (University of California)

  • Jing Shi

    (University of California)

Abstract

Pure spin current, a flow of spin angular momentum without flow of any accompanying net charge, is generated in two common ways. One makes use of the spin Hall effect in normal metals (NM) with strong spin–orbit coupling, such as Pt or Ta. The other utilizes the collective motion of magnetic moments or spin waves with the quasi-particle excitations called magnons. A popular material for the latter is yttrium iron garnet, a magnetic insulator (MI). Here we demonstrate in NM/MI/NM trilayers that these two types of spin currents are interconvertible across the interfaces, predicated as the magnon-mediated current drag phenomenon. The transmitted signal scales linearly with the driving current without a threshold and follows the power-law Tn with n ranging from 1.5 to 2.5. Our results indicate that the NM/MI/NM trilayer structure can serve as a scalable pure spin current valve device which is an essential ingredient in spintronics.

Suggested Citation

  • Junxue Li & Yadong Xu & Mohammed Aldosary & Chi Tang & Zhisheng Lin & Shufeng Zhang & Roger Lake & Jing Shi, 2016. "Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers," Nature Communications, Nature, vol. 7(1), pages 1-6, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10858
    DOI: 10.1038/ncomms10858
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