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.

6 pages, 3 figures

References in corpus (3)

• Asymmetric spin-wave dispersion due to Dzyaloshinskii-Moriya interaction in an ultrathin Pt/CoFeB film
• Vortex Viscosity in Magnetic Superconductors Due to Radiation of Spin Waves
• Measuring spectrum of spin wave using vortex dynamics

Cited by in corpus (7)

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• Magnetization dynamics in proximity-coupled superconductor/ferromagnet/superconductor multilayers
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• Skyrmion Based Magnonic Crystals
• Tailored flux pinning in superconductor/ferromagnet multilayers with engineered magnetic domain morphology from stripes to skyrmions
• Engineered magnetization and exchange stiffness in direct-write Co-Fe nanoelements
• Nonreciprocal magnon fluxonics upon ferromagnet/superconductor hybrids