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03 October 2022
 
  » arxiv » 1907.2751

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Efficient magnonic transport and domain wall landscape of insulating antiferromagnetic thin films
Andrew Ross ; Romain Lebrun ; Olena Gomonay ; Daniel A. Grave ; Asaf Kay ; Lorenzo Baldrati ; Sven Becker ; Alireza Qaiumzadeh ; Camilo Ulloa ; Gerhard Jakob ; Florian Kronast ; Jairo Sinova ; Rembert Duine ; Arne Brataas ; Avner Rothschild ; Mathias Kläui ;
Date 5 Jul 2019
AbstractSpintronics seeks to functionalize antiferromagnetic materials to develop memory and logic devices operating at terahertz speed and robust against external magnetic field perturbations. To be useful, such functionality needs to be developed in thin film devices. The key functionality of long-distance spin-transport has, however, so far only been reported in bulk single crystal antiferromagnets, while in thin films, transport has so far been limited to a few nanometers. In this work, we electrically achieve a long-distance propagation of spin-information in thin films of the insulating antiferromagnet hematite. Through transport and magnetic imaging, we demonstrate a strong correlation between the efficiency of the transport of magnons, which carry spin-information, and the magnetic domain structure of the films. In thin films with large domains, magnons propagate over micrometer distances whilst they attenuate over much shorter distances in multidomain thin films. The governing factor of the attenuation is related to scattering at domain walls, and we demonstrate that we can reduce this through training by field cyclings. For the appropriate crystalline orientation of the films, spin-transport is achieved in zero applied field across micrometers, as required for integration with devices.
Source arXiv, 1907.2751
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