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Using micromagnetic simulations, we have investigated spin dynamics in ananostructure in the presence of thermal fluctuations. In particular, we havestudied the effects of a uniform temperature and of a uniform thermal gradient.In both cases, the stochastic field leads to an increase of the precessionangle of the magnetization, and to a mild decreas of the linewidth of theresonance peaks. Our results indicate that the Gilbert damping parameter playsthe role of control parameter for the amplification of spin waves.

Thermally excited spin waves in a nano-structure: thermal gradient vs. constant temperature