Magnon–fluxon interaction in a ferromagnet/superconductor heterostructure
Dobrovolskiy, OV; Sachser, R; Brächer, T; et al.Böttcher, T; Kruglyak, VV; Vovk, RV; Shklovskij, VA; Huth, M; Hillebrands, B; Chumak, AV
Date: 25 February 2019
Journal
Nature Physics
Publisher
Nature Research
Publisher DOI
Abstract
Ferromagnetism and superconductivity are most fundamental phenomena in condensed-matter physics. Entailing opposite
spin orders, they share an important conceptual similarity: disturbances in magnetic ordering in magnetic materials can propagate
in the form of spin waves (magnons) while magnetic fields penetrate superconductors as a ...
Ferromagnetism and superconductivity are most fundamental phenomena in condensed-matter physics. Entailing opposite
spin orders, they share an important conceptual similarity: disturbances in magnetic ordering in magnetic materials can propagate
in the form of spin waves (magnons) while magnetic fields penetrate superconductors as a lattice of magnetic flux quanta
(fluxons). Despite a rich choice of wave and quantum phenomena predicted, magnon–fluxon coupling has not been observed
experimentally so far. Here, we clearly evidence the interaction of spin waves with a flux lattice in ferromagnet/superconductor
Py/Nb bilayers. We demonstrate that, in this system, the magnon frequency spectrum exhibits a Bloch-like band structure
that can be tuned by the biasing magnetic field. Furthermore, we observe Doppler shifts in the frequency spectra of spin waves
scattered on a flux lattice moving under the action of a transport current in the superconductor.
Physics and Astronomy
Faculty of Environment, Science and Economy
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