Kavli Affiliate: Mamoru Matsuo
| First 5 Authors: Xin Hu, Yuya Ominato, Mamoru Matsuo, ,
| Summary:
We develop a microscopic theory of the spin Seebeck effect (SSE) at the
interface of a bilayer system of a ferromagnetic insulator and graphene. We
compare the tunneling spin current at the interface because of the SSE and the
spin pumping (SP), where the SSE and SP are induced by the temperature gradient
and the microwave irradiation, respectively. We demonstrate that the thermally
driven SSE exhibits a quantum oscillation pattern similar to that predicted in
coherently driven SP. Additionally, we show a peak shift of the quantum
oscillation owing to the contribution of thermally excited magnons with higher
frequencies, which becomes particularly pronounced at higher temperatures.
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