TY - JOUR
T1 - Origin of the spin Seebeck effect in compensated ferrimagnets
AU - Geprägs, Stephan
AU - Kehlberger, Andreas
AU - Coletta, Francesco Della
AU - Qiu, Zhiyong
AU - Guo, Er Jia
AU - Schulz, Tomek
AU - Mix, Christian
AU - Meyer, Sibylle
AU - Kamra, Akashdeep
AU - Althammer, Matthias
AU - Huebl, Hans
AU - Jakob, Gerhard
AU - Ohnuma, Yuichi
AU - Adachi, Hiroto
AU - Barker, Joseph
AU - Maekawa, Sadamichi
AU - Bauer, Gerrit E.W.
AU - Saitoh, Eiji
AU - Gross, Rudolf
AU - Goennenwein, Sebastian T.B.
AU - Kläui, Mathias
N1 - Funding Information:
We would like to thank the Deutsche Forschungsgemeinschaft (DFG) for financial support via SPP 1538 ‘Spin Caloric Transport’ (Project No. GO 944/4-1, BA 2954/2 and KL 1811/7-1), JSPS Grants-in-Aid for Scientific Research (Nos. 25247056, 25220910, and 26103006) and the Graduate School of Excellence Materials Science in Mainz (MAINZ) GSC 266, the EU (IFOX, NMP3-LA-2012 246102; MASPIC, ERC-2007-StG 208162; InSpin FP7-ICT-2013-X 612759), the SpinNet project, and the Research Center of Innovative and Emerging Materials. At Garching, we thank T. Brenninger for technical support, A. Habel and K. Helm-Knapp for the fabrication of the stoichiometric GdIG targets, and M. Schreier as well as J. Lotze for fruitful discussions.
Publisher Copyright:
© 2016, Nature Publishing Group. All rights reserved.
PY - 2016/2/4
Y1 - 2016/2/4
N2 - 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.
AB - 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.
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U2 - 10.1038/ncomms10452
DO - 10.1038/ncomms10452
M3 - Article
AN - SCOPUS:84957535213
SN - 2041-1723
VL - 7
JO - Nature Communications
JF - Nature Communications
M1 - 10452
ER -