paper

Spin caloritronic nano-oscillator

arXiv:1611.00887 · doi:10.1038/s41467-017-00184-5

Abstract

Energy loss due to ohmic heating is a major bottleneck limiting down-scaling and speed of nano-electronic devices, and harvesting ohmic heat for signal processing is a major challenge in modern electronics. Here we demonstrate that thermal gradients arising from ohmic heating can be utilized for excitation of coherent auto-oscillations of magnetization and for generation of tunable microwave signals. The heat-driven dynamics is observed in bilayer nanowires where ohmic heating of the Pt layer results in injection of pure spin current into the layer. This leads to excitation of auto-oscillations of the magnetization and generation of coherent microwave radiation. Our work paves the way towards spin caloritronic devices for microwave and magnonic applications.

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