Phys. Rev. Lett. 102, 147202 (2009) [4 pages]Current-Induced Control of Spin-Wave AttenuationReceived 3 December 2008; published 8 April 2009 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.147202
DOI:
10.1103/PhysRevLett.102.147202
PACS:
75.30.Ds, 85.70.−w, 85.75.−d
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