Spin-Torque Ferromagnetic Resonance Induced by the Spin Hall Effect

Luqiao Liu, Takahiro Moriyama, D. C. Ralph, and R. A. Buhrman
Phys. Rev. Lett. 106, 036601 – Published 20 January 2011

Abstract

We demonstrate that the spin Hall effect in a thin film with strong spin-orbit scattering can excite magnetic precession in an adjacent ferromagnetic film. The flow of alternating current through a Pt/NiFe bilayer generates an oscillating transverse spin current in the Pt, and the resultant transfer of spin angular momentum to the NiFe induces ferromagnetic resonance dynamics. The Oersted field from the current also generates a ferromagnetic resonance signal but with a different symmetry. The ratio of these two signals allows a quantitative determination of the spin current and the spin Hall angle.

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  • Received 12 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.036601

© 2011 American Physical Society

Authors & Affiliations

Luqiao Liu, Takahiro Moriyama, D. C. Ralph, and R. A. Buhrman

  • Cornell University, Ithaca, New York, 14853

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Issue

Vol. 106, Iss. 3 — 21 January 2011

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