Spin Transport across Antiferromagnetic Cr<sub>2</sub>O<sub>3</sub> Films Grown on Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>

ORAL

Abstract

Spin transport in heterostructures containg antiferromagnetic materials has attracted a lot of attention due to the enhanced transmission of the pure spin current and the interesting orientation dependence. Compared with NiO, Cr2O3 is a better-defined antiferromagnet for its uniaxial anisotropy. Here we report a spin transport study of YIG/Cr2O3/Pt heterostructures, in which both YIG and Cr2O3 are grown by PLD. RHEED patterns indicate that Cr2O3 is textured polycrystalline on single crystal YIG with preferred c-axis along the easy axis of the YIG. We perform both magnetoresistance(MR) and spin Seebeck effect (SSE) measurements. When the in-plane magnetic field is applied along or perpendicular to the c-axis of textured Cr2O3, the high-field MR responses in both directions resemble those of the YIG/Pt. When the field is along the c-axis of textured Cr2O3, MR shows an additional peak feature ~1T at 5 K, and the peak position moves to higher fields at higher temperatures, indicative of the spin-flop transition of Cr2O3. The SSE signal shows a sign reversal at low temperature, which does not exist in YIG/Pt and therefore is also attributed to the Cr2O3.

*This work was supported by SHINES, which is funded by the U.S.DOE, Office of Science, Basic Energy Sciences under Award SC0012670.

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Presenters

  • Yawen Liu

    • Physics, UCR
    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside
    • Physics and Astronomy, UC riverside

Authors

  • Yawen Liu

    • Physics, UCR
    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside
    • Physics and Astronomy, UC riverside

  • Wei Yuan

    • Department of Physics and Astronomy, University of California, Riverside

  • Qiming Shao

    • Electrical Engineering, University of California, Los Angeles
    • Electrical and Computer Engineering, University of California, Los Angeles
    • ECE, UCLA
    • University of California, Los Angeles
    • Electrical and Computer Engineering Department, University of California, Los Angeles
    • Department of Electrical Engineering, University of California, Los Angeles

  • Kang Wang

    • University of California, Los Angeles
    • Electrical and Computer Engineering, University of California, Los Angeles
    • Department of Electrical Engineering, University of California, Los Angeles

  • Jing Shi

    • Department of Physics and Astronomy, University of California, Riverside
    • University of California, Riverside