Vertex Dependent Dynamic Response of a Connected Kagome Artificial Spin Ice

TL;DR

This study investigates how vertex magnetization configurations influence the dynamic resonant modes in connected Kagome artificial spin ice, revealing controllable features relevant for magnonic and spintronic applications.

Contribution

It demonstrates that vertex magnetization affects mode frequencies and shows how to control these modes using field protocols, advancing understanding of spin ice dynamics.

Findings

Mode frequencies depend on vertex magnetization configuration.

LDW mode indicates domain wall nucleation and dynamics.

Modes can be controlled via magnetic field protocols.

Abstract

We present the dynamic response of a connected Kagome artificial spin ice with emphasis on the effect of the vertex magnetization configuration on the mode characteristics. We use broadband ferromagnetic resonance (FMR) spectroscopy and micromagnetic simulations to identify and characterize resonant modes. We find the mode frequencies of elongated, single-domain film segments not only depend on the orientation of their easy-axis with respect to the applied magnetic field, but also depend on the vertex magnetization configuration, which suggests control over the FMR mode can be accomplished by altering the vertex magnetization. Moreover, we study differences between the vertex center mode (VCM) and the localized domain wall (LDW) mode. We show that the LDW mode acts as a signature of the domain wall (DW) nucleation process and the DW dynamics active during segment reversal events. The results show the VCM and LDW modes can be controlled using a field protocol, which has important implications for applications in magnonic and spintronic devices.