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

## TL;DR

Researchers show that chiral spin textures in magnetic films can be used to create tunable microwave resonators without nanofabrication, enabling energy-efficient, reconfigurable devices for communications and computing.

## Contribution

A materials-driven approach to reconfigurable GHz resonances using chiral spin textures, enabling analog tuning without physical nanopatterning.

## Key findings

- A minimally damped, strongly chiral multilayer enables robust broadband resonance spectra.
- In situ reconfigurability of spin textures allows analog modulation of resonant dispersion.
- Microwave spectroscopy and simulations reveal distinct resonance features from CST transitions.

## Abstract

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.

Tunable microwave components ‐ essential for wireless technology ‐ typically require costly, customized nanofabrication. We show that ambient spin texture ensembles (e.g., magnetic skyrmions) in chiral multilayer films can enable reconfigurable microwave resonators. By controlling magnetic field history, we achieve widely programmable GHz dispersion tuning without physical nanopatterning. This materials‐driven approach enables compact, energy‐efficient devices for next‐generation communications and unconventional computing.