Analog Control of Reconfigurable GHz Resonances from Chiral Spin Texture Ensembles.

Gigahertz excitations of magnetic films are widely explored for energy-efficient, high-frequency microelectronics. The advent of nanoscale chiral spin textures (CSTs) with topological dynamics promises novel resonance characteristics. However, prior works on technologically relevant chiral multilayers encountered key material constraints, precluding the realization of functional CST resonances. We address this by engineering a minimally damped, strongly chiral multilayer with a robust broadband resonance spectrum. Microwave spectroscopy, Lorentz microscopy, and simulations elucidate contrasting resonance features on either side of zero magnetic field arising from distinct irreversible CST transitions. A simple analytical model can quantitatively describe these robust inter-textural resonances over the entire field-frequency range. Crucially, in situ CST reconfigurability enables analog tunability of the resonant dispersion - with wide-band, deterministic, non-linear (or linear) modulation via the input knob. Our work unlocks the microwave potential of multilayer CSTs by leveraging their unique thermodynamics. It opens the door to fabrication-free reconfigurable magnonics, toward broadband transmission and unconventional computing.