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. GoennenweinMathias Kläui

Research output: Contribution to journalArticle

73 Citations (Scopus)

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.

Original languageEnglish
Article number10452
JournalNature communications
Volume7
DOIs
Publication statusPublished - Feb 4 2016

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Geprägs, S., Kehlberger, A., Coletta, F. D., Qiu, Z., Guo, E. J., Schulz, T., Mix, C., Meyer, S., Kamra, A., Althammer, M., Huebl, H., Jakob, G., Ohnuma, Y., Adachi, H., Barker, J., Maekawa, S., Bauer, G. E. W., Saitoh, E., Gross, R., ... Kläui, M. (2016). Origin of the spin Seebeck effect in compensated ferrimagnets. Nature communications, 7, [10452]. https://doi.org/10.1038/ncomms10452