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
Year of first publication:	2020
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
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-5586
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Nature Communications 11
Pages or article number:	6332
Publisher:	Nature Publishing Group UK
Publisher place:	London
Issue date:	2020
ISSN:	2041-1723
Publisher URL:	https://doi.org/10.1038/s41467-020-20155-7
Publisher DOI:	10.1038/s41467-020-20155-7
Appears in collections:	JGU-Publikationen