Origin of the spin Seebeck effect in compensated ferrimagnets

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2016
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Geprägs, Stephan
Kehlberger, Andreas
Coletta, Francesco Della
Qiu, Zhiyong
Guo, Er-Jia
Schulz, Tomek
Mix, Christian
Meyer, Sibylle
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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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ISO 690GEPRÄGS, Stephan, Andreas KEHLBERGER, Francesco Della COLETTA, Zhiyong QIU, Er-Jia GUO, Tomek SCHULZ, Christian MIX, Sibylle MEYER, Akashdeep KAMRA, Mathias KLÄUI, 2016. Origin of the spin Seebeck effect in compensated ferrimagnets. In: Nature Communications. 2016, 7, 10452. eISSN 2041-1723. Available under: doi: 10.1038/ncomms10452
BibTex
@article{Geprags2016Origi-40412,
  year={2016},
  doi={10.1038/ncomms10452},
  title={Origin of the spin Seebeck effect in compensated ferrimagnets},
  volume={7},
  journal={Nature Communications},
  author={Geprägs, Stephan and Kehlberger, Andreas and Coletta, Francesco Della and Qiu, Zhiyong and Guo, Er-Jia and Schulz, Tomek and Mix, Christian and Meyer, Sibylle and Kamra, Akashdeep and Kläui, Mathias},
  note={Article Number: 10452}
}
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