True amplification of spin waves in magnonic nano-waveguides.

Autor: Merbouche H; Institute of Applied Physics, University of Muenster, Corrensstrasse 2-4, 48149, Muenster, Germany., Divinskiy B; Institute of Applied Physics, University of Muenster, Corrensstrasse 2-4, 48149, Muenster, Germany., Gouéré D; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., Lebrun R; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., El Kanj A; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., Cros V; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., Bortolotti P; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., Anane A; Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France., Demokritov SO; Institute of Applied Physics, University of Muenster, Corrensstrasse 2-4, 48149, Muenster, Germany., Demidov VE; Institute of Applied Physics, University of Muenster, Corrensstrasse 2-4, 48149, Muenster, Germany. demidov@uni-muenster.de.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Feb 20; Vol. 15 (1), pp. 1560. Date of Electronic Publication: 2024 Feb 20.
DOI: 10.1038/s41467-024-45783-1
Abstrakt: Magnonic nano-devices exploit magnons - quanta of spin waves - to transmit and process information within a single integrated platform that has the potential to outperform traditional semiconductor-based electronics. The main missing cornerstone of this information nanotechnology is an efficient scheme for the amplification of propagating spin waves. The recent discovery of spin-orbit torque provided an elegant mechanism for propagation losses compensation. While partial compensation of the spin-wave losses has been achieved, true amplification - the exponential increase in the spin-wave intensity during propagation - has so far remained elusive. Here we evidence the operating conditions to achieve unambiguous amplification using clocked nanoseconds-long spin-orbit torque pulses in magnonic nano-waveguides, where the effective magnetization has been engineered to be close to zero to suppress the detrimental magnon scattering. We achieve an exponential increase in the intensity of propagating spin waves up to 500% at a propagation distance of several micrometers.
(© 2024. The Author(s).)
Databáze: MEDLINE
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