Quantifying Spin Hall Angles from Spin Pumping: Experiments and Theory

O. Mosendz, J. E. Pearson, F. Y. Fradin, G. E. W. Bauer, S. D. Bader, and A. Hoffmann
Phys. Rev. Lett. 104, 046601 – Published 28 January 2010

Abstract

Spin Hall effects intermix spin and charge currents even in nonmagnetic materials and, therefore, ultimately may allow the use of spin transport without the need for ferromagnets. We show how spin Hall effects can be quantified by integrating Ni80Fe20|normal metal (N) bilayers into a coplanar waveguide. A dc spin current in N can be generated by spin pumping in a controllable way by ferromagnetic resonance. The transverse dc voltage detected along the Ni80Fe20|N has contributions from both the anisotropic magnetoresistance and the spin Hall effect, which can be distinguished by their symmetries. We developed a theory that accounts for both. In this way, we determine the spin Hall angle quantitatively for Pt, Au, and Mo. This approach can readily be adapted to any conducting material with even very small spin Hall angles.

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  • Received 17 July 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.046601

©2010 American Physical Society

Authors & Affiliations

O. Mosendz1,*, J. E. Pearson1, F. Y. Fradin1, G. E. W. Bauer2, S. D. Bader1,3, and A. Hoffmann1,3

  • 1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 2Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands
  • 3Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *mosendz@anl.gov

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Vol. 104, Iss. 4 — 29 January 2010

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