Geometric Aspects of the Dipolar Interaction in Lattices of Small Particles

TL;DR

This paper investigates how dipolar interactions influence the magnetic hysteresis and remanence in layered small particle systems, revealing temperature-dependent magnetic states through Monte Carlo simulations.

Contribution

It provides a detailed analysis of the geometric effects on dipolar interactions in layered particle lattices, highlighting the temperature-driven transition between magnetic states.

Findings

Remanence peaks at a specific temperature indicating a transition.

Antiferromagnetic order causes low remanence at low temperatures.

Layer number and particle spacing significantly affect magnetic behavior.

Abstract

The hysteresis curves of systems composed of small interacting magnetic particles, regularly placed on stacked layers, are obtained with Monte Carlo simulations. The remanence as a function of temperature, in interacting systems, presents a peak that separates two different magnetic states. At low temperatures, small values of remanence are a consequence of antiferromagnetic order due to the dipolar interaction. At higher values of temperature the increase of the component normal to the lattice plane is responsible for the small values of remanence. The effect of the number of layers, coordination number and distance between particles are investigated.