Control of magnetic configuration and spin-wave dynamics in magnonic-superconducting hybrids.

One of the challenges in magnonics is the local control of the magnetization configuration and dynamics. One potential solution is to use a hybrid device that combines ferromagnetic (FM) and superconducting (SC) components that are electromagnetically coupled by the fields generated by superconducting eddy currents and precessing magnetization. This method is highly attractive for controlling magnetic state and resonant frequencies. We will demonstrate that the spin waves can be confined in a uniform magnetic layer by the stray field of a SC strip, while a sequence of SC stripes creates tunable magnonic crystal in pristine FM layer. Moreover, we propose an alternative approach to generate the skyrmion by the field produced by SC ring placed in the vicinity of the magnetic system, made of the material which does not exhibit DMI. Finally, we propose a simple explanation of the recently discovered effect of the significant FMR frequency increase in an FM film sandwiched between two SC layers.