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Cherenkov radiation of spin waves by ultra-fast moving magnetic flux quanta

Abstract : Despite theoretical predictions for a Cherenkov-type radiation of spin waves (magnons) by various propagating magnetic perturbations, fast-enough moving magnetic field stimuli have not been available so far. Here, we experimentally realize the Cherenkov radiation of spin waves in a Co-Fe magnonic conduit by fast-moving (>1 km/s) magnetic flux quanta (Abrikosov vortices) in an adjacent Nb-C superconducting strip. The radiation is evidenced by the microwave detection of spin waves propagating a distance of 2 micrometers from the superconductor and it is accompanied by a magnon Shapiro step in its current-voltage curve. The spin-wave excitation is unidirectional and monochromatic, with sub-40 nm wavelengths determined by the period of the vortex lattice. The phase-locking of the vortex lattice with the excited spin wave limits the vortex velocity and reduces the dissipation in the superconductor.
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Preprints, Working Papers, ...
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Contributor : Inspire Hep <>
Submitted on : Tuesday, April 6, 2021 - 10:07:50 PM
Last modification on : Tuesday, May 11, 2021 - 11:49:30 PM

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O.V. Dobrovolskiy, Q. Wang, D.Yu. Vodolazov, B. Budinska, R. Sachser, et al.. Cherenkov radiation of spin waves by ultra-fast moving magnetic flux quanta. 2021. ⟨hal-03191158⟩



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