Transport signatures of interfacial exchange coupling and chiral spin textures in magnetic insulator thin films

ORAL

Abstract

Ferrimagnetic insulators (FMIs) attract tremendous interest for spintronic applications due to high characteristic frequency, low Gilbert damping, and absence of Ohmic loss. First, we demonstrate the critical role of dimensionality on the SOT efficiency by systematically studying the FMI layer thickness dependent SOT efficiency in tungsten/thulium iron garnet (W/TmIG) bilayers. Current-induced switching in FMI thin films is demonstrated with a thickness up to 15 nm [1]. Second, we use temperature dependent Hall measurements to identify contributions of spin Hall, magnetic proximity, and sublattice effects to the anomalous Hall signal in various heavy metal/ferrimagnetic insulator heterostructures. This approach enables detection of both the magnetic proximity effect onset temperature and magnetization compensation temperature and provides essential information regarding the interfacial exchange coupling. At last, we show the transport signatures of chiral spin textures, topological Hall effect, in the platinum/ferrimagnetic insulator bilayer. [1] Q. Shao, et al., Nat. Commun., 9, 3612 (2018)

*We acknowledge funding support from SHINES (DE-SC0012670), MURI (W911NF-16-1-0472 and W911NF-15-1-10561), and TANMS (EEC-1160504).

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Presenters

  • 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

Authors

  • 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

  • Yawen Liu

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

  • Alexander Grutter

    • National Institute of Standards and Technology
    • NIST
    • NIST Center for Neutron Research, NIST Gaithersburg
    • Neutron-Condensed Matter Science Group, NIST
    • NIST Center for Neutron Research

  • Guoqiang Yu

    • Electrical Engineering, University of California, Los Angeles
    • Chinese Academy of Sciences
    • ECE, UCLA

  • Se Kwon Kim

    • Physics, UCLA
    • Department of Physics and Astronomy, University of Missouri - Columbia

  • Xiaoyu Che

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

  • Chi Tang

    • Physics, UCR

  • Yaroslav Tserkovnyak

    • Univ of California - Los Angeles
    • Physics, UCLA
    • Physics, Univ of California - Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles
    • Physics, University of California, Los Angeles
    • University of California, Los Angeles

  • Jing Shi

    • University of California, Riverside
    • Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA
    • Physics, UCR
    • Physics and Astronomy, University of California, Riverside
    • Physics and Astronomy, UC riverside

  • Kang L. Wang

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