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Fermi level dependent spin pumping from a magnetic insulator into a topological insulator

Hailong Wang1, James Kally1, Cüneyt Şahin2,3, Tao Liu4, Wilson Yanez1, Eric J. Kamp1, Anthony Richardella1, Mingzhong Wu4, Michael E. Flatté2,3 et al.

Nitin Samarth1,*

  • 1Department of Physics and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 2Department of Physics and Astronomy, Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, USA
  • 3Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
  • 4Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
  • *nsamarth@psu.edu
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Phys. Rev. Research 1, 012014(R) – Published 28 August, 2019

DOI: https://doi.org/10.1103/PhysRevResearch.1.012014

Abstract

Topological spintronics aims to exploit the spin-momentum locking in the helical surface states of topological insulators for spin-orbit torque devices. We address a fundamental question that still remains unresolved in this context: Does the topological surface state alone produce the largest values of spin-charge conversion efficiency or can the strongly spin-orbit coupled bulk states also contribute significantly? By studying the Fermi level dependence of spin pumping in topological insulator/ferrimagnetic insulator bilayers, we show that the spin Hall conductivity is constant when the Fermi level is tuned across the bulk band gap, consistent with a full bulk band calculation. The results suggest a different perspective, wherein “bulk-surface correspondence” allows spin-charge conversion to be simultaneously viewed either as coming from the full bulk band, or from spin-momentum locking of the surface state.

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Phys. Rev. Research 1, 012014(R)– Published 28 August, 2019
  • Received 2 April 2019
  • Revised 26 June 2019
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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