Cited by 2,243Magnetic properties of thin filmsQuantum and electron transport phenomenaAdvanced Condensed Matter Physics

Observation of the spin Seebeck effect

Uchida, K., Takahashi, S., Harii, K., Ieda, J., Koshibae, W., Ando, K., Maekawa, S., Saitoh, E.·2008·Nature

Abstract

The generation of electric voltage by placing a conductor in a temperature gradient is called the Seebeck effect. Its efficiency is represented by the Seebeck coefficient, S, which is defined as the ratio of the generated electric voltage to the temperature difference, and is determined by the scattering rate and the density of the conduction electrons. The effect can be exploited, for example, in thermal electric-power generators and for temperature sensing, by connecting two conductors with different Seebeck coefficients, a device called a thermocouple. Here we report the observation of the thermal generation of driving power, or voltage, for electron spin: the spin Seebeck effect. Using a recently developed spin-detection technique that involves the spin Hall effect, we measure the spin voltage generated from a temperature gradient in a metallic magnet. This thermally induced spin voltage persists even at distances far from the sample ends, and spins can be extracted from every position on the magnet simply by attaching a metal. The spin Seebeck effect observed here is directly applicable to the production of spin-voltage generators, which are crucial for driving spintronic devices. The spin Seebeck effect allows us to pass a pure spin current, a flow of electron spins without electric currents, over a long distance. These innovative capabilities will invigorate spintronics research.

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Crossref · 10.1038/nature07321

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  • The thermal gradient from laser-induced heating of the FM film can lead to different charge flow for majority and minority carriers due to their different Seebeck coefficients and a net spin current, which drives spin polarization into the NM film.

    “the thermal gradient from the laser-induced heating of the FM film can lead to different charge flow for the majority and minority carriers due to their different Seebeck coefficients and a net spin current123, , which drives the transport of spin polarization into the NM film.”

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Authors
Uchida, K., Takahashi, S., Harii, K., Ieda, J., Koshibae, W., Ando, K., Maekawa, S., & Saitoh, E.
Affiliations
  • Keio University (JP)
  • Tohoku University (JP)
  • RIKEN (JP)
Corresponding author
Saitoh, E.
Venue
Nature
Published
2008-10
Volume
455
Issue
7214
Pages
778-781
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1969565830
Cited by
2,243
References
27
Citations by year
2026: 97 · 2025: 131 · 2024: 114 · 2023: 133 · 2022: 134 · 2021: 178 · 2020: 159 · 2019: 160 · 2018: 173 · 2017: 170 · 2016: 136 · 2015: 150 · 2014: 154 · 2013: 119 · 2012: 93
FWCI
27.48
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
Japan Society for the Promotion of Science
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
Keywords
spin Seebeck effect, thermoelectric effect, spin Hall effect, spin voltage, pure spin current, spintronic devices, temperature gradient, spin detection

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