Spin-Torque Ferromagnetic Resonance Induced by the Spin Hall Effect

• DOI: 10.1103/physrevlett.106.036601
• Publication Date: 2011-01-20T17:02:26Z
• Authors: Luqiao Liu; Takahiro Moriyama; D. C. Ralph; R. A. Buhrman
• Keywords: Spin pumping; Precession; Spin wave; Spin-transfer torque; Larmor precession

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