Quantifying Spin Hall Angles from Spin Pumping

Experiments and Theory

Journal article (2010)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © 2010 The Author(s); American Physical Society
DOI: https://doi.org/doi:10.1103/PhysRevLett.104.046601
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Published Date

28-01-2010

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Source:

Physical Review Letters, 104 (4), 2010

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

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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