Resonant nonlinear damping of quantized spin waves in ferromagnetic nanowires: a spin torque ferromagnetic resonance study.
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.
Boone
C T
CT
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Katine
J A
JA
Childress
J R
JR
Tiberkevich
V
V
Slavin
A
A
Zhu
J
J
Cheng
X
X
Krivorotov
I N
IN