Thermo-spin effects in magnetic insulators
Professor Ken-ichi Uchida
Date & Time: 14:00 - 15:00, June 17th (Fri), 2016.
Place: 8F Medium Seminar Room(#811-812), Sengen
Abstract:
In spin-caloritronics, the interplay among spin, charge, and heat currents has been extensively studied from the viewpoints of fundamental physics and thermoelectric applications. One of the triggers of this research trend is the discovery of the spin Seebeck effect (SSE), which refers to spin-current generation as a result of a temperature gradient. In 2014, the first observation of the spin Peltier effect (SPE), the reciprocal of the SSE, was reported. In this talk, we review our recent experimental results on the SSE and SPE in magnetic insulators. Firstly, we show the high-magnetic-field response of the SSE, which confirms magnon origin of the SSE and clarifies its spectral non-uniform nature. Secondly, we show several demonstrations of the SSE in various structures for future thermoelectric applications, where we focus mainly on multilayer systems. Finally, we report thermal imaging of the SPE, which reveals the spatial distribution and magnitude of spin-current-induced temperature modulation.