Yuichi Ohnuma

TL;DR: It is demonstrated that higher-energy exchange magnons play a key role in the SSE, which is caused by thermally excited spin dynamics that are converted to a voltage by the inverse spin Hall effect at the interface to a heavy metal contact.

TL;DR: In this paper, a linear response formulation of the dc spin pumping was developed in view of describing many-body effects caused by spin fluctuations in the spin sink, and it was shown that when an itinerant ferromagnet near a spin sink was used as the spin sinks, the spin pumping is largely increased owing to the fluctuation enhancement of the spin conductance across the precessing ferromagneticnet/spin sink interface.

Abstract: We theoretically investigate the spin Seebeck effect (SSE) in antiferromagnets and ferrimagnets, and show that the SSE vanishes in antiferromagnets but survives in ferrimagnets even at the magnetization compensation point despite the absence of its saturation magnetization. The nonvanishing SSE in ferrimagnets stems from two nondegenerate magnons. We demonstrate that the magnitude of the SSE in ferrimagnets is unchanged across the magnetization compensation point.

TL;DR: In this article, the spin-diffusion equation coupled with fluid vorticity is derived, and it is shown that spin currents are generated by the vortic gradient in both laminar and turbulent flows and that the generated spin currents can be detected by the inverse spin Hall voltage measurements, which are predicted to be proportional to the flow velocity.

TL;DR: It is shown that the spin-current noise can be used to determine the effective spin carried by a magnon modified by the non-spin-conserving process at the interface, and it provides information on the effectivespin of aMagnon, heating at the interfaces under spin pumping, and spin Hall angle of the NM.