Non-local spin transport measurement in TbIG thin films grown by pulsed laser deposition

ORAL

Abstract

Ferrimagnetic insulators (FMIs) attract a lot of attention in spintronics recently. As a medium, FMIs support pure spin current carried by magnon transport over a relatively long distance. In this work, we use nonlocal method to probe spin transport in terbium iron garnet (Tb3Fe5O12 or TbIG). We obtain high-quality epitaxial TbIG thin films on the substrates of GGG(111) using a PLD system. After 750 degree Celsius post-growth rapid thermal annealing, clear RHEED patterns demonstrate the single crystal quality of TbIG films, which is further confirmed by X-ray diffraction and atomic force microscopy results. The non-local signal has a sign reversal at 270 K, which corresponds to the compensation temperature of TbIG. Below the compensation temperature, the non-local signal stays approximately constant until a dramatic increase sets in at 50 K, which persists to the lowest temperature of 2 K. We attribute this rapid increase to the spin current transport associated with paramagnetic Tb-spins. We also discuss the temperature dependence of the nonlocal signal in garnets with and without rare-earth moments.

*We acknowledge SHINES, an Energy Frontier Research Center funded by the U.S. Department of energy, Office of Science, Basic Energy Sciences, award no. SC0012670

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Presenters

  • Wei Yuan

    • University of California, Riverside

Authors

  • Wei Yuan

    • University of California, Riverside

  • Junxue Li

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

  • Victor Ortiz

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

  • Yawen Liu

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

  • Jing Shi

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