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Authors: Lebrun, Romain
Ross, Andrew
Gomonay, Olena
Baltz, V.
Ebels, U.
Barra, A.-L.
Qaiumzadeh, Alireza
Brataas, Arne
Sinova, Jairo
Kläui, Mathias
Title: Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet alpha-Fe2O3
Online publication date: 11-Feb-2021
Language: english
Abstract: Antiferromagnetic materials can host spin-waves with polarizations ranging from circular to linear depending on their magnetic anisotropies. Until now, only easy-axis anisotropy antiferromagnets with circularly polarized spin-waves were reported to carry spin-information over long distances of micrometers. In this article, we report long-distance spin-transport in the easy-plane canted antiferromagnetic phase of hematite and at room temperature, where the linearly polarized magnons are not intuitively expected to carry spin. We demonstrate that the spin-transport signal decreases continuously through the easy-axis to easy-plane Morin transition, and persists in the easy-plane phase through current induced pairs of linearly polarized magnons with dephasing lengths in the micrometer range. We explain the long transport distance as a result of the low magnetic damping, which we measure to be <= 10(-5) as in the best ferromagnets. All of this together demonstrates that long-distance transport can be achieved across a range of anisotropies and temperatures, up to room temperature, highlighting the promising potential of this insulating antiferromagnet for magnon-based devices. Hitherto, only circularly polarized antiferromagnetic (AFM) spin-waves (SWs) were expected to convey spin-information. Here, the authors present persistent spin-transport over long distances in the easy-plane AFM phase of hematite, alpha -Fe2O3, via linearly polarized SW pairs with ultra-low damping.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: CC-BY
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Journal: Nature Communications
Pages or article number: 6332
Publisher: Nature Publishing Group UK
Publisher place: London
Issue date: 2020
ISSN: 2041-1723
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Appears in collections:JGU-Publikationen

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