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Anderson-Higgs mechanism of mass generation is a generic concept inhigh-energy and condensed matter physics. It shows up through the Meissnereffect providing the expulsion of static and low-frequency magnetic fields fromsuperconductors. However, it does not affect propagating electromagnetic waveswith a spectrum gap determined by the plasma frequency, which is too large tobe sensitive to the superconducting transition. Here we demonstrate thespectroscopic manifestation of the Anderson-Higgs mass, showing that itdetermines the spectrum gap of magnons insuperconductor/ferromagnet/superconductor multilayers. Moreover, we show thatthis effect has been observed in recent experiments as a spontaneousferromagnetic resonance frequency shift in such systems. Our theory explainsmany unusual experimental features and suggests effective controls over themagnon spectrum with tunable spectral gap and group-velocity reversal. Thesefindings pave the way to a wide range of advanced functionalities for possibleapplications in magnonics.

Anderson-Higgs mass of magnons in superconductor/ferromagnet/superconductor systems