Enhancement of spin-wave propagation using topological insulators

ORAL

Abstract

Spin-wave damping in planar Yttrium Iron Garnet (YIG) films remains the main drawback in integrating ferromagnetic films with Radio Frequency Integrated Circuits. Most studies have often used Pt as a source of spin current through the spin Hall effect to provide an anti-damping torque. Apart from Pt and other heavy metals, another class of materials that can also be used are topological insulators (TI) where the current at the surface is spin polarized. Therefore, YIG/TI has great potential to enhance spin-wave propagation in ferromagnetic materials.
Here, we present the first study of spin-wave amplification in LPE YIG/TI. We used a 15 nm thick Bi2Se3 as the TI layer, which was grown by molecular beam epitaxy on a 3 μm thick YIG layer. We measured the change in spin-wave amplitude as the current in the TI layer was varied. We used the critical current density as our figure of merit which is the current density required to entirely suppress spin-wave damping. We show that this current is three times smaller than that in YIG/Pt which means TI is a more efficient material for spin-wave amplification.

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Presenters

  • Aryan Navabi

    Univ of California - Los Angeles

Authors

  • Aryan Navabi

    Univ of California - Los Angeles

  • Yuxiang Liu

    Univ of California - Los Angeles, Electrical Engineering, University of California Los Angeles

  • Pramey Upadhyaya

    Univ of California - Los Angeles

  • Farbod Ebrahimi

    Inston Inc.

  • Guoqiang Yu

    University of California, Los Angeles, Univ of California - Los Angeles, Department of Electrical Engineering, UCLA, BeiHang University, Electrical Engineering, University of California Los Angeles

  • Koichi Murata

    Univ of California - Los Angeles, Electrical Engineering, UCLA

  • Lei Pan

    Univ of California - Los Angeles, Department of Electrical Engineering, University of California, Los Angeles, University of California Los Angeles, UCLA, Electrical Engineering, UCLA

  • Pedram Khalili Amiri

    Northwestern University

  • Alexey Feofanov

    University of Innsbruck, University of Waterloo, Korea University, Okinawa Institute of Science and Technology, University of California - Los Angeles, The University of Manchester, University of Puerto Rico at Humacao, Department of Physics & Electronics, University of Puerto Rico at Cayey, Department of Mathematics-Physics, Oak Ridge National Lab, Max Planck Institute for Chemical Physics of Solids, Department of Physics, University of Puerto Rico, Electrical Engineering Department, University of Arkansas, Department of Physics, University of Arkansas, School of Basic Sciences at IIT Mandi, H.P., India, Computational Biology, Flatiron Institute, Physics, Hong Kong Univ of Sci & Tech, University of California, Los Angeles, Max Planck Inst, Institute for Theoretical Physics, University of Cologne, Department of Physics, Simon Fraser University, Deutsches Elektronen Synchrotron (DESY), Institut fur Theoretische Physik, Univerisitat zu Berlin, Institut fur Physik, Univerisitat zu Berlin, Plymouth State University, The Graduate Center, CUNY, Nordita, KTH Royal Institute of Technology and Stockholm University, Univ of Connecticut - Storrs, Univ Stuttgart, University of Chicago, University of Texas at El Paso, University of Tulsa, California Institute of Technology, Georgia Institute of Technology, Universite Paris Diderot, Laboratoire MPQ, Universita di Trento, BEC Center, ICTP Trieste, Universita di Pisa, Inst of Physics Academia Sinica, Batelle, Cal State Univ- San Bernardino, Chemical Engineering, University of Michigan, QCD Labs, Department of Applied Physics, Aalto University, Yale University, MIT, Harvard Univ, Chemical & Environmental Engineering, University of California, Riverside, University of Frankfurt, Germany, University of Hamburg, Germany, Naval Research Laboratory, Cornell Univ, National Institute for Material Science, U.S. Naval Research Laboratory, Washington DC, Materials Engineering, University of Santa Barbara, Institute of Physics, Chinese Academy of Sciences, Univ of Texas, Arlington, MIT Lincoln Laboratory, University of Sydney, Iowa State University, Purdue University, Kansas State University, University of Maryland, John Hopkins University, Universite de Sherbrooke, Physics, Konkuk University, Perimeter Institute, University of Waterloo, D-Wave, San Jose State University, Université de Sherbrooke, Institute of Physics, EPFL - Lausanne​

  • Kang Wang

    University of California, Los Angeles, Univ of California - Los Angeles, Department of Electrical Engineering, University of California, Los Angeles, Department of Electrical Engineering, UCLA, University of California Los Angeles, UCLA, Department of Electrical Engineering, Univ of California - Los Angeles, Electrical and Computer Engineering, University of California, Los Angeles, Electrical Engineering, UCLA