Spin wave spectral probing of degenerate microstates in building-block of square artificial spin ice

Nimisha Arora,Pintu Das

doi:10.1063/9.0000175

Abstract

We have investigated the spin wave modes of dipolar coupled, highly shape anisotropic magnetic nanoislands forming square artificial spin ice system by performing micromagnetic simulations using MuMax3 in combination with Matlab coding. Here, artificial spin ice is considered to be formed by the four identical square ring-type structure of elliptical shaped nanoislands of permalloy. Our results demonstrate a direct relation between the spin wave modes generated and the micro-states formed in the system. Thus, we show that single ring type structure may alone be adequately used to understand the spin wave modes of square artificial spin ice.

Highlights

Square artificial spin ice (S-ASI) is the 2-dimensional realization of spin ice behavior observed in 3-dimensional oxide pyrochlore compounds such as Dy2Ti2O7, Ho2Ti2O7, etc
Recent studies indicate that ASI can be conceived as analogs of magnonic crystals with tunable band structures offering useful functionalities for applications such as in logic devices
We report the results of investigation on how spin wave modes are effected due to the magnetization reversals of single-domain nanostructures obtained by performing micromagnetic simulations

Summary

Introduction

Square artificial spin ice (S-ASI) is the 2-dimensional realization of spin ice behavior observed in 3-dimensional oxide pyrochlore compounds such as Dy2Ti2O7, Ho2Ti2O7, etc.1 Such designer nanostructured materials offer possibilities to investigate variety of fascinating phenomena such as physics of frustration,2 emergent magnetic monopoles,3 collective magnetization dynamics of interacting spins,4 and phase transition,5 etc. We report the results of investigation on how spin wave modes are effected due to the magnetization reversals of single-domain nanostructures obtained by performing micromagnetic simulations.

Results

Conclusion