August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

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

Aug 31, 2021, 1:30 PM
Room A

Room A

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Oleksandr Dobrovolskiy (University of Vienna)


Despite theoretical predictions for the Cherenkov radiation of spin waves (magnons) by various propagating magnetic perturbations, it has not been observed so far. Our recent experiments arXiv:2103.10156 evidence the Cherenkov radiation of magnons in a Co-Fe magnonic conduit by fast-moving magnetic flux quanta (Abrikosov vortices) in an adjacent Nb-C superconducting strip. The radiation is evidenced by the microwave detection of spin waves and it is accompanied by a magnon Shapiro step in superconductor's 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 magnon/fluxon phase-locking limits the vortex velocity and reduces the dissipation in the superconductor.

Primary authors

Oleksandr Dobrovolskiy (University of Vienna) Qi Wang (University of Vienna) Denis Vodolazov (Institute for Physics of Microstructures, RAS, Afonino, Russia) Barbora Budinská (University of Vienna) Roland Sachser (Physics Institute, Goethe University Frankfurt am Main, Germany) Andrii Chumak (University of Vienna) Michael Huth (Physics Institute, Goethe University Frankfurt am Main, Germany) Alexander Buzdin (Universite Bordeaux, CNRS, LOMA, Talence, France)

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