Dipolar interactions in arrays of ferromagnetic nanowires: a micromagnetic study

TL;DR

This study uses micromagnetic simulations to analyze the magnetic behavior of nanowire arrays, highlighting the limitations of finite models and validating a mean field approach for infinite systems.

Contribution

It systematically compares finite and infinite size models, demonstrating the validity of a scaled mean field model for array magnetization behavior.

Findings

Finite size models often fail to capture infinite system features.

Mean field model scaled to porosity accurately describes array magnetization.

Systematic analysis of 1D and 2D nanowire arrays using micromagnetic simulations.

Abstract

We explore the behavior of periodic arrays of magnetic nanowires by micromagnetic simulations using the Nmag modeling package. A large number of modeling studies on such arrays of nanowires have been performed using finite size models. We show that these finite size micromagnetic descriptions can only be used in specific situations. We perform a systematic study of more or less dense 1D and 2D arrays of nanowires using either finite size or infinite size models and we show that finite size models fail to capture some of the features of real infinite systems. We show that that the mean field model scaled to the system porosity is valid. This work can be used as a basis to the extension of micromagnetic calculations of the magnetization dynamics in arrays of nanowires.