Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3

R. Lebrun (), A. Ross, O. Gomonay, V. Baltz, U. Ebels, A.-L. Barra, A. Qaiumzadeh, A. Brataas, J. Sinova and M. Kläui ()
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R. Lebrun: Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay
A. Ross: Johannes Gutenberg-Universität Mainz
O. Gomonay: Johannes Gutenberg-Universität Mainz
V. Baltz: Univ. Grenoble Alpes, CNRS, CEA, Grenoble INP, SPINTEC
U. Ebels: Univ. Grenoble Alpes, CNRS, CEA, Grenoble INP, SPINTEC
A.-L. Barra: Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA-EMFL
A. Qaiumzadeh: Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology
A. Brataas: Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology
J. Sinova: Johannes Gutenberg-Universität Mainz
M. Kläui: Johannes Gutenberg-Universität Mainz

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-20155-7

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