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

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 below 0.0001 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.
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https://hal.archives-ouvertes.fr/hal-03010584
Contributor : Vincent Baltz <>
Submitted on : Tuesday, November 17, 2020 - 5:54:47 PM
Last modification on : Tuesday, February 23, 2021 - 7:00:02 PM

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  • HAL Id : hal-03010584, version 1
  • ARXIV : 2005.14414

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Romain Lebrun, Andrew Ross, Olena Gomonay, Vincent Baltz, Ursula Ebels, et al.. Long-distance spin-transport across the Morin phase transition up to room temperature in the ultra-low damping alpha-Fe2O3 antiferromagnet. Nature Communications, Nature Publishing Group, 2020, 11, pp.6332. ⟨hal-03010584⟩

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