The effect of the size of the system, aspect ratio and impurities concentration on the dynamic of emergent magnetic monopoles in artificial spin ice systems

TL;DR

This study investigates how system size, aspect ratio, and impurities influence the behavior of magnetic monopoles in artificial spin ice, using a computational model to simulate real-time dynamics at room temperature.

Contribution

It introduces a frustrated cellular automata model based on charge and dipolar interactions to simulate the dynamics of artificial spin ice systems efficiently.

Findings

High density of Dirac strings observed under certain geometric parameters

Emergent magnetic monopoles are prevalent in the system

Disorder affects the density and distribution of monopoles

Abstract

In this work we study the dynamical properties of a finite array of nanomagnets in artificial kagome spin ice at room temperature. The dynamic response of the array of nanomagnets is studied by implementing a "frustrated celular aut\'omata" (FCA), based in the charge model and dipolar model. The FCA simulations, allow us to study in real-time and deterministic way, the dynamic of the system, with minimal computational resource. The update function is defined according to the coordination number of vertices in the system. Our results show that for a set geometric parameters of the array of nanomagnets, the system exhibits high density of Dirac strings and high density emergent magnetic monopoles. A study of the effect of disorder in the arrangement of nanomagnets is incorporated in this work.