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Authors: Ross, Andrew
Lebrun, Romain
Evers, Martin
Deák, András
Szunyogh, László
Nowak, Ulrich
Kläui, Mathias
Title: Exceptional sign changes of the nonlocal spin Seebeck effect in antiferromagnetic hematite
Online publication date: 20-Aug-2021
Language: english
Abstract: Low-power spintronic devices based on the propagation of pure magnonic spin currents in antiferromagnetic insulator materials offer several distinct advantages over ferromagnetic components including higher-frequency magnons and a stability against disturbing external magnetic fields. In this work, we make use of the insulating antiferromagnetic phase of iron oxide, the mineral hematite alpha-Fe2O3 to investigate the long-distance transport of thermally generated magnonic spin currents. We report on the excitation of magnons generated by the spin Seebeck effect, transported both parallel and perpendicular to the antiferromagnetic easy-axis under an applied magnetic field. Making use of an atomistic hematite toy model, we calculate the transport characteristics from the deviation of the antiferromagnetic ordering from equilibrium under an applied field. We resolve the role of the magnetic order parameters in the transport, and experimentally we find significant thermal spin transport without the need for a net magnetization.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Accepted version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: in Copyright
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Journal: Physical review : B
Pages or article number: 224433
Publisher: American Physical Society
Publisher place: Ridge, NY
Issue date: 2021
ISSN: 2469-9950
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Publisher DOI: 10.1103/PhysRevB.103.224433
Appears in collections:JGU-Publikationen

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