Origin of the spin Seebeck effect in compensated ferrimagnets

Stephan Geprägs (), Andreas Kehlberger, Francesco Della Coletta, Zhiyong Qiu, Er-Jia Guo, Tomek Schulz, Christian Mix, Sibylle Meyer, Akashdeep Kamra, Matthias Althammer, Hans Huebl, Gerhard Jakob, Yuichi Ohnuma, Hiroto Adachi, Joseph Barker, Sadamichi Maekawa, Gerrit E. W. Bauer, Eiji Saitoh, Rudolf Gross, Sebastian T. B. Goennenwein () and Mathias Kläui ()
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Stephan Geprägs: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Andreas Kehlberger: Institute of Physics, Johannes Gutenberg-University Mainz
Francesco Della Coletta: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Zhiyong Qiu: WPI Advanced Institute for Materials Research, Tohoku University
Er-Jia Guo: Institute of Physics, Johannes Gutenberg-University Mainz
Tomek Schulz: Institute of Physics, Johannes Gutenberg-University Mainz
Christian Mix: Institute of Physics, Johannes Gutenberg-University Mainz
Sibylle Meyer: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Akashdeep Kamra: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Matthias Althammer: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Hans Huebl: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Gerhard Jakob: Institute of Physics, Johannes Gutenberg-University Mainz
Yuichi Ohnuma: Institute for Materials Research, Tohoku University
Hiroto Adachi: ERATO, Japan Science and Technology Agency
Joseph Barker: Institute for Materials Research, Tohoku University
Sadamichi Maekawa: ERATO, Japan Science and Technology Agency
Gerrit E. W. Bauer: WPI Advanced Institute for Materials Research, Tohoku University
Eiji Saitoh: WPI Advanced Institute for Materials Research, Tohoku University
Rudolf Gross: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Sebastian T. B. Goennenwein: Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
Mathias Kläui: Institute of Physics, Johannes Gutenberg-University Mainz

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Magnons are the elementary excitations of a magnetically ordered system. In ferromagnets, only a single band of low-energy magnons needs to be considered, but in ferrimagnets the situation is more complex owing to different magnetic sublattices involved. In this case, low lying optical modes exist that can affect the dynamical response. Here we show that the spin Seebeck effect (SSE) is sensitive to the complexities of the magnon spectrum. The SSE is caused by thermally excited spin dynamics that are converted to a voltage by the inverse spin Hall effect at the interface to a heavy metal contact. By investigating the temperature dependence of the SSE in the ferrimagnet gadolinium iron garnet, with a magnetic compensation point near room temperature, we demonstrate that higher-energy exchange magnons play a key role in the SSE.

Date: 2016
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DOI: 10.1038/ncomms10452

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