Critical suppression of spin Seebeck effect by magnetic fields

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

doi:10.1103/PhysRevB.92.064413

Critical suppression of spin Seebeck effect by magnetic fields

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

IMR - Integrated Research Division

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158 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 language	English
Article number	064413
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.92.064413
Publication status	Published - 2015 Aug 10

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10.1103/PhysRevB.92.064413

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title = "Critical suppression of spin Seebeck effect by magnetic fields",

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.",

author = "Takashi Kikkawa and Uchida, {Ken Ichi} and Shunsuke Daimon and Zhiyong Qiu and Yuki Shiomi and Eiji Saitoh",

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doi = "10.1103/PhysRevB.92.064413",

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AU - Kikkawa, Takashi

AU - Uchida, Ken Ichi

AU - Daimon, Shunsuke

AU - Qiu, Zhiyong

AU - Shiomi, Yuki

AU - Saitoh, Eiji

PY - 2015/8/10

Y1 - 2015/8/10

N2 - 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.

AB - 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.

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Critical suppression of spin Seebeck effect by magnetic fields

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