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arXiv · 0905.4699

Resonant Nonlinear Damping of Quantized Spin Waves in Ferromagnetic Nanowires

Carl Boone·Jordan Katine·Jeff Childress·Vasil Tiberkevich·Andrei Slavin·Jian Zhu·Xiao Cheng·Ilya Krivorotov
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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.

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Carl Boone, Jordan Katine, Jeff Childress, Vasil Tiberkevich, Andrei Slavin, Jian Zhu, Xiao Cheng, Ilya Krivorotov. 2009-05-28. Resonant Nonlinear Damping of Quantized Spin Waves in Ferromagnetic Nanowires. https://doi.org/10.1103/physrevlett.103.167601

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