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Current-Induced Control of Spin-Wave Attenuation

2009; American Physical Society; Volume: 102; Issue: 14 Linguagem: Inglês

10.1103/physrevlett.102.147202

1092-0145

Soo-Man Seo, Kyung‐Jin Lee, Hyunsoo Yang, Teruo Ono,

Advanced Memory and Neural Computing

The current-induced modification of the attenuation of a propagating spin wave in a magnetic nanowire is studied theoretically and numerically. The attenuation length of spin wave can increase when the spin waves and electrons move in the same direction. It is directly affected by the nonadiabaticity of the spin-transfer torque and thus can be used to estimate the nonadiabaticity. When the nonadiabatic spin torque is sufficiently large, the attenuation length becomes negative, resulting in the amplification of spin waves.