Transient response of the spin Peltier effect revealed by lock-in thermoreflectance measurements

Takumi Yamazaki; Ryo Iguchi; Tadakatsu Ohkubo; Hosei Nagano; Ken Ichi Uchida

doi:10.1103/PhysRevB.101.020415

Transient response of the spin Peltier effect revealed by lock-in thermoreflectance measurements

Takumi Yamazaki, Ryo Iguchi, Tadakatsu Ohkubo, Hosei Nagano, Ken Ichi Uchida

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Transient response of the spin Peltier effect (SPE) in a Pt/yttrium iron garnet junction system has been investigated by means of a lock-in thermoreflectance method. We applied an alternating charge current to the Pt layer to drive SPE through the spin Hall effect, and measured the AC response of the resultant SPE-induced temperature modulation at frequencies ranging from 10 Hz to 1 MHz. We found that the SPE-induced temperature modulation decreases with increasing the frequency when the frequency is >1kHz. This is a characteristic feature of SPE revealed by the high frequency measurements based on lock-in thermoreflectance, while previous low frequency measurements showed that the SPE signal is independent of the frequency. We attribute the decrease of the temperature modulation to the length scale of the SPE-induced heat current; by comparing the experimental results with one-dimensional heat conduction calculations, the length scale of SPE is estimated to be 0.94 μm.

Original language	English
Article number	020415
Journal	Physical Review B
Volume	101
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.101.020415
Publication status	Published - 2020 Jan 28

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.101.020415

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title = "Transient response of the spin Peltier effect revealed by lock-in thermoreflectance measurements",

abstract = "Transient response of the spin Peltier effect (SPE) in a Pt/yttrium iron garnet junction system has been investigated by means of a lock-in thermoreflectance method. We applied an alternating charge current to the Pt layer to drive SPE through the spin Hall effect, and measured the AC response of the resultant SPE-induced temperature modulation at frequencies ranging from 10 Hz to 1 MHz. We found that the SPE-induced temperature modulation decreases with increasing the frequency when the frequency is >1kHz. This is a characteristic feature of SPE revealed by the high frequency measurements based on lock-in thermoreflectance, while previous low frequency measurements showed that the SPE signal is independent of the frequency. We attribute the decrease of the temperature modulation to the length scale of the SPE-induced heat current; by comparing the experimental results with one-dimensional heat conduction calculations, the length scale of SPE is estimated to be 0.94 μm.",

author = "Takumi Yamazaki and Ryo Iguchi and Tadakatsu Ohkubo and Hosei Nagano and Uchida, {Ken Ichi}",

note = "Funding Information: The authors thank T. Yagi, Y. Yamashita, N. Ogawa, T. Ishizaki, R. Hisatomi, and G.E.W. Bauer for valuable discussions and J. Uzuhashi, H. Nakayama, and M. Isomura for technical support. This work was supported by CREST “Creation of Innovative Core Technologies for Nano-enabled Thermal Management” (Grant No. JPMJCR17I1) from JST, Japan, Grant-in-Aid for Scientific Research (B) (Grant No. JP19H02585), Grant-in-Aid for Early-Career Scientists (Grant No. JP18K14116), and Grant-in-Aid for Scientific Research (S) (Grant No. JP18H05246) from JSPS KAKENHI, Japan, and Joint Research Hub Program from NIMS, Japan. T.Y. is supported by Grant-in-Aid for JSPS Fellows (Grant No. JP18J23465). Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

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doi = "10.1103/PhysRevB.101.020415",

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AU - Yamazaki, Takumi

AU - Iguchi, Ryo

AU - Ohkubo, Tadakatsu

AU - Nagano, Hosei

AU - Uchida, Ken Ichi

N1 - Funding Information: The authors thank T. Yagi, Y. Yamashita, N. Ogawa, T. Ishizaki, R. Hisatomi, and G.E.W. Bauer for valuable discussions and J. Uzuhashi, H. Nakayama, and M. Isomura for technical support. This work was supported by CREST “Creation of Innovative Core Technologies for Nano-enabled Thermal Management” (Grant No. JPMJCR17I1) from JST, Japan, Grant-in-Aid for Scientific Research (B) (Grant No. JP19H02585), Grant-in-Aid for Early-Career Scientists (Grant No. JP18K14116), and Grant-in-Aid for Scientific Research (S) (Grant No. JP18H05246) from JSPS KAKENHI, Japan, and Joint Research Hub Program from NIMS, Japan. T.Y. is supported by Grant-in-Aid for JSPS Fellows (Grant No. JP18J23465). Publisher Copyright: © 2020 American Physical Society.

PY - 2020/1/28

Y1 - 2020/1/28

N2 - Transient response of the spin Peltier effect (SPE) in a Pt/yttrium iron garnet junction system has been investigated by means of a lock-in thermoreflectance method. We applied an alternating charge current to the Pt layer to drive SPE through the spin Hall effect, and measured the AC response of the resultant SPE-induced temperature modulation at frequencies ranging from 10 Hz to 1 MHz. We found that the SPE-induced temperature modulation decreases with increasing the frequency when the frequency is >1kHz. This is a characteristic feature of SPE revealed by the high frequency measurements based on lock-in thermoreflectance, while previous low frequency measurements showed that the SPE signal is independent of the frequency. We attribute the decrease of the temperature modulation to the length scale of the SPE-induced heat current; by comparing the experimental results with one-dimensional heat conduction calculations, the length scale of SPE is estimated to be 0.94 μm.

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Transient response of the spin Peltier effect revealed by lock-in thermoreflectance measurements

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