Amplification of spin waves by thermal spin-transfer torque |
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Authors: | Padrón-Hernández E Azevedo A Rezende S M |
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Affiliation: | Departamento de Física, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil. |
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Abstract: | We observe amplification of spin-wave packets propagating along a film of single-crystal yttrium iron garnet subject to a transverse temperature gradient. The spin waves are excited and detected with standard techniques used in magnetostatic microwave delay lines in the 1-2 GHz frequency range. The amplification is attributed to the action of a thermal spin-transfer torque acting on the magnetization that opposes the relaxation and which is created by spin currents generated through the spin-Seebeck effect. The experimental data are interpreted with a spin-wave model that gives an amplification gain in very good agreement with the data. |
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