Print Email Facebook Twitter Origin of the spin Seebeck effect in compensated ferrimagnets Title Origin of the spin Seebeck effect in compensated ferrimagnets Author 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. Goennenwein, S.T.B. Kläui, M. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2016-02-04 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. Subject physical sciencescondensed matter To reference this document use: http://resolver.tudelft.nl/uuid:140b6573-b4bd-466b-8f00-01f17972e60f ISSN 2041-1723 Source https://doi.org/10.1038/ncomms10452 Source Nature Communications, 7, 2016 Part of collection Institutional Repository Document type journal article Rights (c) CC BY - This work is licensed under a Creative Commons Attribution 4.0 International License Files PDF 329138.pdf 780.97 KB Close viewer /islandora/object/uuid:140b6573-b4bd-466b-8f00-01f17972e60f/datastream/OBJ/view