Critical suppression of spin Seebeck effect by magnetic fields

Takashi Kikkawa, Ken Ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, Eiji Saitoh

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

The longitudinal spin Seebeck effect (LSSE) in Pt/Y3Fe5O12(YIG) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low temperatures. The field-induced suppression of the LSSE in the Pt/YIG-slab system is too large at around room temperature to be explained simply by considering the effect of the Zeeman gap in magnon excitation. This result requires us to introduce a magnon-frequency-dependent mechanism into the scenario of LSSE; low-frequency magnons dominantly contribute to the LSSE. The magnetic field dependence of the LSSE voltage was observed to change by changing the thickness of YIG, suggesting that the thermospin conversion by the low-frequency magnons is suppressed in thin YIG films due to the long characteristic lengths of such magnons.

Original languageEnglish
Article number064413
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number6
DOIs
Publication statusPublished - 2015 Aug 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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