Coherent spin-wave transport in an antiferromagnet.

Autor: Hortensius JR; Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands., Afanasiev D; Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands., Matthiesen M; Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands., Leenders R; Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YW, United Kingdom., Citro R; Dipartimento di Fisica 'E.R. Caianiello', Università di Salerno and Spin-CNR, I-84084 Fisciano (Sa), Italy., Kimel AV; Institute for Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, The Netherlands., Mikhaylovskiy RV; Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YW, United Kingdom., Ivanov BA; Institute of Magnetism, National Academy of Sciences and Ministry of Education and Science, 03142 Kyiv, Ukraine., Caviglia AD; Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.
Jazyk: angličtina
Zdroj: Nature physics [Nat Phys] 2021 Sep; Vol. 17 (9), pp. 1001-1006. Date of Electronic Publication: 2021 Jul 29.
DOI: 10.1038/s41567-021-01290-4
Abstrakt: Magnonics is a research field complementary to spintronics, in which quanta of spin waves (magnons) replace electrons as information carriers, promising lower dissipation 1-3 . 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 possible 4,5 . Antiferromagnets can host spin waves at terahertz (THz) frequencies and are therefore seen as a future platform for the fastest and the least dissipative transfer of information 6-11 . 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 nanometer-scale wavepacket of coherent propagating magnons in antiferromagnetic DyFeO 3 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 THz spin waves. The wavepacket contains magnons with a shortest detected wavelength of 125 nm that propagate with supersonic velocities of more than 13 km/s into the material. This source of coherent short-wavelength spin carriers opens up new prospects for THz antiferromagnetic magnonics and coherence-mediated logic devices at THz frequencies.
Competing Interests: Competing interests: The authors declare no competing interests.
Databáze: MEDLINE
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