Enhancement of spin-seebeck voltage by spin-hall thermopile

Ken Ichi Uchida, Tatsumi Nonaka, Tatsuro Yoshino, Takashi Kikkawa, Daisuke Kikuchi, Eiji Saitoh

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


Voltage signals induced by the spin-Seebeck effect (SSE) are shown to be enhanced by introducing a thermopile structure consisting of two different metals with positive and negative spin-Hall angles. In the "spin-Hall thermopile", the positive and negative SSE signals in the metals are added to the output voltage in series. Here, we demonstrate that a Pt/Nb thermopile on an Y 3Fe 5O 12 (YIG) slab exhibits the SSE voltage one order of magnitude greater than that in a plain Pt/YIG system. Since the spin-Hall thermopile enables sensitive detection of a spin voltage in a versatile manner, it will be useful to construct spin and heat sensors.

Original languageEnglish
Article number093001
JournalApplied Physics Express
Issue number9
Publication statusPublished - 2012 Sept


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