Origin of the spin Seebeck effect in compensated ferrimagnets

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 t...

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Main Authors:	Geprägs, Stephan, Kehlberger, Andreas, Coletta, Francesco Della, Qiu, Zhiyong, Guo, Er-Jia, Schulz, Tomek, Mix, Christian, Meyer, Sibylle, Kamra, Akashdeep, Althammer, Matthias, Huebl, Hans, Jakob, Gerhard, Ohnuma, Yuichi, Adachi, Hiroto, Barker, Joseph, Maekawa, Sadamichi, Bauer, Gerrit E. W., Saitoh, Eiji, Gross, Rudolf, Goennenwein, Sebastian T. B., Kläui, Mathias
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742853/

id	pubmed-4742853
recordtype	oai_dc
spelling	pubmed-47428532016-03-04 Origin of the spin Seebeck effect in compensated ferrimagnets Geprägs, Stephan Kehlberger, Andreas Coletta, Francesco Della Qiu, Zhiyong Guo, Er-Jia Schulz, Tomek Mix, Christian Meyer, Sibylle Kamra, Akashdeep Althammer, Matthias Huebl, Hans Jakob, Gerhard Ohnuma, Yuichi Adachi, Hiroto Barker, Joseph Maekawa, Sadamichi Bauer, Gerrit E. W. Saitoh, Eiji Gross, Rudolf Goennenwein, Sebastian T. B. Kläui, Mathias Article 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. Nature Publishing Group 2016-02-04 /pmc/articles/PMC4742853/ /pubmed/26842873 http://dx.doi.org/10.1038/ncomms10452 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Geprägs, Stephan Kehlberger, Andreas Coletta, Francesco Della Qiu, Zhiyong Guo, Er-Jia Schulz, Tomek Mix, Christian Meyer, Sibylle Kamra, Akashdeep Althammer, Matthias Huebl, Hans Jakob, Gerhard Ohnuma, Yuichi Adachi, Hiroto Barker, Joseph Maekawa, Sadamichi Bauer, Gerrit E. W. Saitoh, Eiji Gross, Rudolf Goennenwein, Sebastian T. B. Kläui, Mathias
spellingShingle	Geprägs, Stephan Kehlberger, Andreas Coletta, Francesco Della Qiu, Zhiyong Guo, Er-Jia Schulz, Tomek Mix, Christian Meyer, Sibylle Kamra, Akashdeep Althammer, Matthias Huebl, Hans Jakob, Gerhard Ohnuma, Yuichi Adachi, Hiroto Barker, Joseph Maekawa, Sadamichi Bauer, Gerrit E. W. Saitoh, Eiji Gross, Rudolf Goennenwein, Sebastian T. B. Kläui, Mathias Origin of the spin Seebeck effect in compensated ferrimagnets
author_facet	Geprägs, Stephan Kehlberger, Andreas Coletta, Francesco Della Qiu, Zhiyong Guo, Er-Jia Schulz, Tomek Mix, Christian Meyer, Sibylle Kamra, Akashdeep Althammer, Matthias Huebl, Hans Jakob, Gerhard Ohnuma, Yuichi Adachi, Hiroto Barker, Joseph Maekawa, Sadamichi Bauer, Gerrit E. W. Saitoh, Eiji Gross, Rudolf Goennenwein, Sebastian T. B. Kläui, Mathias
author_sort	Geprägs, Stephan
title	Origin of the spin Seebeck effect in compensated ferrimagnets
title_short	Origin of the spin Seebeck effect in compensated ferrimagnets
title_full	Origin of the spin Seebeck effect in compensated ferrimagnets
title_fullStr	Origin of the spin Seebeck effect in compensated ferrimagnets
title_full_unstemmed	Origin of the spin Seebeck effect in compensated ferrimagnets
title_sort	origin of the spin seebeck effect in compensated ferrimagnets
description	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.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742853/
_version_	1613534418641616896

Origin of the spin Seebeck effect in compensated ferrimagnets

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