Spin Transport across Antiferromagnetic Cr2O3 Films Grown on Y3Fe5O12

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.

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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