In this work, we study the magnetization dynamics in a superconductor-ferromagnet ($S$-$F$) thin-film multilayer. Theoretical considerations supported by broadband ferromagnetic resonance spectroscopy reveal the development of acoustic and optic resonance modes in $S$-$F$ multilayers at significantly higher frequencies in comparison to the Kittel mode of individual $F$ layers. These modes are formed due to antiferromagneticlike interactions between $F$ layers via shared circulating superconducting currents in the $S$ layers. The gap between resonance modes is determined by the thickness and superconducting penetration depth in the $S$ layers. Overall, the rich spectrum of $S$-$F$ multilayers and its tunability may open up wide prospects for application of these multilayers in magnonics as well as in various superconducting hybrid systems.

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• Magnetization dynamics
• Proximity effect
• Spintronics
• Low-temperature superconductors
• Magnonic crystals
• Multilayer thin films
• Synthetic antiferromagnetic multilayers
• Ferromagnetic resonance