Spin Seebeck Effect: Amplification of Spin Waves by Thermal Torque

Details Spin Seebeck Effect: Amplification of Spin Waves by Thermal Torque Spin Seebeck Effect: Amplification of Spin Waves by Thermal Torque

2011-07-06

arxiv.org/abs/1107.1271v2

Physics

Condensed Matter

Other Condensed Matter

8 pages, 8 figures This paper has been withdrawn by the author in order to be rewriten!

Scientific paper

We observe amplification of spin-wave packets propagating along a film of yttrium iron garnet (YIG) subject to a transverse temperature gradient. The amplification is attributed to a spin-transfer thermal torque created by spin currents generated by means of the spin Seebeck effect that acts on the magnetization and opposes the relaxation. The experimental data are interpreted with a simple theoretical model using spin-wave theory that gives an amplification gain in very good agreement with measurements.

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