title: Resonant nonlinear damping of quantized spin waves in ferromagnetic nanowires: a spin torque ferromagnetic resonance study.
abstract: We use spin torque ferromagnetic resonance to measure the spectral properties of dipole-exchange spin waves in Permalloy nanowires. Our measurements reveal that geometric confinement has a profound effect on the damping of spin waves in the nanowire geometry. The damping parameter of the lowest-energy quantized spin-wave mode depends on applied magnetic field in a resonant way and exhibits a maximum at a field that increases with decreasing nanowire width. This enhancement of damping originates from a nonlinear resonant three-magnon confluence process allowed at a particular bias field value determined by quantization of the spin-wave spectrum in the nanowire geometry.
authors.affiliation: Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
authors.forename: C T
authors.initials: CT
authors.lastname: Boone
authors.forename: J A
authors.initials: JA
authors.lastname: Katine
authors.forename: J R
authors.initials: JR
authors.lastname: Childress
authors.forename: V
authors.initials: V
authors.lastname: Tiberkevich
authors.forename: A
authors.initials: A
authors.lastname: Slavin
authors.forename: J
authors.initials: J
authors.lastname: Zhu
authors.forename: X
authors.initials: X
authors.lastname: Cheng
authors.forename: I N
authors.initials: IN
authors.lastname: Krivorotov