Angular-Dependent Dynamic Response and Magnetization Reversal in Fibonacci-Distorted, Kagome Artificial Spin Ice

TL;DR

This study investigates how the angular orientation of magnetic fields affects the ferromagnetic resonance spectra and magnetization reversal processes in Fibonacci-distorted Kagome artificial spin ice, revealing control variables for future magnonic devices.

Contribution

It introduces the impact of Fibonacci distortion and field orientation on FMR modes and magnetization reversal in Kagome ASI, highlighting new control mechanisms.

Findings

Number of FMR modes depends on magnetic field orientation.

Discontinuities in FMR dispersion indicate multi-step magnetization reversal.

Fibonacci distortion influences energy degeneracy and magnetic behavior.

Abstract

We have measured the angular dependence of ferromagnetic resonance (FMR) spectra for Fibonacci-distorted, Kagome artificial spin ice (ASI). The number of strong modes in the FMR spectra depend on the orientation of the applied DC magnetic field. In addition, discontinuities observed in the FMR field-frequency dispersion curves also depend on DC field orientation, and signal a multi-step DC magnetization reversal, which is caused by the reduced energy degeneracy of Fibonacci-distorted vertices. The results suggest the orientation of applied magnetic field and severity of Fibonacci distortion constitute control variables for FMR modes and multi-step reversal in future magnonic devices and magnetic switching systems.