title: Spin-torque ferromagnetic resonance induced by the spin Hall effect.
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.
authors.affiliation: Cornell University, Ithaca, New York 14853, USA.
authors.forename: Luqiao
authors.initials: L
authors.lastname: Liu
authors.forename: Takahiro
authors.initials: T
authors.lastname: Moriyama
authors.forename: D C
authors.initials: DC
authors.lastname: Ralph
authors.forename: R A
authors.initials: RA
authors.lastname: Buhrman