Magnetization Dynamics of Topological Defects and the Spin Solid in Kagome Artificial Spin Ice

TL;DR

This study investigates the magnetization dynamics in kagome artificial spin ice using broadband spin-wave spectroscopy and micromagnetic simulations, revealing resonances linked to spin-solid states and monopole pairs, with implications for reprogrammable magnonics.

Contribution

It provides new insights into the resonant behaviors of kagome artificial spin ice and demonstrates microwave-assisted switching to generate highly-charged vertices.

Findings

Identification of resonances related to spin-solid-state and monopole pairs

Resonances exhibit characteristic magnetic field dependencies

Potential for reprogrammable magnonic applications

Abstract

We report broadband spin-wave spectroscopy on kagome artificial spin ice (ASI) made of large arrays of interconnected Ni$_{80}$Fe$_{20}$ nanobars. Spectra taken in saturated and disordered states exhibit a series of resonances with characteristic magnetic field dependencies. Making use of micromagnetic simulations, we identify resonances that reflect the spin-solid-state and monopole-antimonopole pairs on Dirac strings. The latter resonances allow for the generation of highly-charged vertices in ASIs via microwave assisted switching. Our findings open further perspectives for fundamental studies on ASIs and their usage in reprogrammable magnonics.