S. Borlenghi, M. Franchin, H. Fangohr, L. Bergqvist, a. Delin
In this article we report on micromagnetic simulations performed on a permalloy nanostructure in presence of a uniform thermal gradient. Our numerical simulations show that heat flow is an effective mean to compensate the damping, and that the gradients at which spin-wave amplification is observed are experimentally accessible. In particular, we have studied the role of the Gilbert damping parameter on spin-wave amplification. Moreover, we have developed a simple model based on a classical transport equation, which describes this phenomenon in qualitative agreement with our numerical simulations.
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http://arxiv.org/abs/1205.5650
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