Magnon-Fluxon interaction in a ferromagnet/superconductor heterostructure
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 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 which 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.
Keywords
Cite
@article{arxiv.1901.06156,
title = {Magnon-Fluxon interaction in a ferromagnet/superconductor heterostructure},
author = {O. V. Dobrovolskiy and R. Sachser and T. Brächer and T. Fischer and V. V. Kruglyak and R. V. Vovk and V. A. Shklovskij and M. Huth and B. Hillebrands and A. V. Chumak},
journal= {arXiv preprint arXiv:1901.06156},
year = {2019}
}
Comments
6 pages, 3 figures