Vector Spin Seebeck Effect in antiferromagnet LuFeO<sub>3</sub> with canted spins

ORAL  · Invited

Abstract

The generation, detection and manipulation of spins are imperative for spintronics research and applications. The spin injection through the spin Seebeck effect (SSE), typically done on magnets with collinear moments, is always along the out-of-plane direction. Here, we report the observation of a vector SSE effect in antiferromagnet (AF) LuFeO3 with canted spins. The temperature gradient applied along out-of-plane on the c-axis as well as in ab-plane directions both inject spin current from AF insulator into the heavy metal layer and voltage generated by inverse spin Hall effect can be detected. We show that the detected thermovoltages are related to the canted spin structure of LuFeO3 and are viable in zero magnetic field. Both the canted spin direction and the sign of the detected thermovoltages can be controlled by a small magnetic field at around 150 Oe at room temperature. [1] These results have been compared with that from a similar experiment on LaFeO3. [2] This class of AF insulators broaden the scope for exploring spin phenomena and provide a new class of material for low-field antiferromagnetic spin caloritronics.

**This work was supported by National Science Foundation, Grants No. 1729555 and No. 1949701.

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Publication: [1] Xu, Jinsong, Jiaming He, J-S. Zhou, Danru Qu, Ssu-Yen Huang, and C. L. Chien. "Observation of Vector Spin Seebeck Effect in a Noncollinear Antiferromagnet." Physical Review Letters 129, no. 11, 117202 (2022).
[2] W. Lin, J. He, B. Ma, M. Matzelle, J. Xu, J. Freeland, Y. Choi, D. Haskel, B. Barbiellini, A. Bansil, G. A. Fiete, J. Zhou, and C. L. Chien. Evidence for spin swapping in an antiferromagnet. Nat. Phys. 18, 800 (2022).

Presenters

  • Jiaming He

    • University of Texas at Austin

Authors

  • Jiaming He

    • University of Texas at Austin

  • Jinsong Xu

    • Johns Hopkins University

  • Jianshi Zhou

    • University of Texas at Austin
    • The University of Texas at Austin
    • University of Texas

  • Danru Qu

    • National Taiwan University
    • Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan

  • Ssu-Yen Huang

    • National Taiwan University
    • Department of Physics, National Taiwan University, Taipei 10617, Taiwan

  • C. L. Chien

    • Johns Hopkins University
    • Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA