en
Scientific article
English

Coherent spin-wave transport in an antiferromagnet

Published inNature physics, vol. 17, no. 9, p. 1001-1006
Publication date2021-07-29
First online date2021-07-29
Abstract

Magnonics is a research field complementary to spintronics, in which the quanta of spin waves (magnons) replace electrons as information carriers, promising lower dissipation1,2,3. The development of ultrafast, nanoscale magnonic logic circuits calls for new tools and materials to generate coherent spin waves with frequencies as high and wavelengths as short as possible4,5. Antiferromagnets can host spin waves at terahertz frequencies and are therefore seen as a future platform for the fastest and least dissipative transfer of information6,7,8,9,10,11. However, the generation of short-wavelength coherent propagating magnons in antiferromagnets has so far remained elusive. Here we report the efficient emission and detection of a nanometre-scale wavepacket of coherent propagating magnons in the antiferromagnetic oxide dysprosium orthoferrite using ultrashort pulses of light. The subwavelength confinement of the laser field due to large absorption creates a strongly non-uniform spin excitation profile, enabling the propagation of a broadband continuum of coherent terahertz spin waves. The wavepacket contains magnons with a shortest detected wavelength of 125 nm that propagate into the material with supersonic velocities of more than 13 km s–1. This source of coherent short-wavelength spin carriers opens up new prospects for terahertz antiferromagnetic magnonics and coherence-mediated logic devices at terahertz frequencies.

eng
Affiliation Not a UNIGE publication
Research group
Funding
  • European Commission - Shaken and stirred: Terahertz electric field control of magnetism [852050]
Citation (ISO format)
HORTENSIUS, J.R. et al. Coherent spin-wave transport in an antiferromagnet. In: Nature physics, 2021, vol. 17, n° 9, p. 1001–1006. doi: 10.1038/s41567-021-01290-4
Main files (1)
Article (Published version)
accessLevelRestricted
Identifiers
ISSN of the journal1745-2473
194views
3downloads

Technical informations

Creation02/03/2022 12:56:00 PM
First validation02/03/2022 12:56:00 PM
Update time16/03/2023 2:46:33 AM
Status update16/03/2023 2:46:32 AM
Last indexation06/05/2024 10:12:35 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack