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Spin transport across antiferromagnets induced by the spin Seebeck effect
Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany.;Grad Sch Excellence Mat Sci Mainz MAINZ, D-55128 Mainz, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Univ Konstanz, Dept Phys, D-78457 Constance, Germany..
Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany.;Grad Sch Excellence Mat Sci Mainz MAINZ, D-55128 Mainz, Germany.;Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China..
Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany.;Singulus Technol AG, D-63796 Kahl, Germany..
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2018 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 51, no 14, article id 144004Article in journal (Refereed) Published
Abstract [en]

For prospective spintronics devices based on the propagation of pure spin currents, antiferromagnets are an interesting class of materials that potentially entail a number of advantages as compared to ferromagnets. Here, we present a detailed theoretical study of magnonic spin current transport in ferromagnetic-antiferromagnetic multilayers by using atomistic spin dynamics simulations. The relevant length scales of magnonic spin transport in antiferromagnets are determined. We demonstrate the transfer of angular momentum from a ferromagnet into an antiferromagnet due to the excitation of only one magnon branch in the antiferromagnet. As an experimental system, we ascertain the transport across an antiferromagnet in Y3Fe5O12 vertical bar Ir20Mn80 vertical bar Pt heterostructures. We determine the spin transport signals for spin currents generated in the Y3Fe5O12 by the spin Seebeck effect and compare to measurements of the spin Hall magnetoresistance in the heterostructure stack. By means of temperature-dependent and thickness-dependent measurements, we deduce conclusions on the spin transport mechanism across Ir20Mn80 and furthermore correlate it to its paramagnetic-antiferromagnetic phase transition.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 51, no 14, article id 144004
Keywords [en]
spin Seebeck effect, magnon spin currents, antiferromagnetic spintroncis
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-350723DOI: 10.1088/1361-6463/aab223ISI: 000427364400004OAI: oai:DiVA.org:uu-350723DiVA, id: diva2:1206167
Funder
German Research Foundation (DFG), SPP 1538, SFB767, SFB TRR173EU, FP7, Seventh Framework Programme, FP7-ICT-2013-X 612759Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved

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Ritzmann, Ulrike

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