Vortex core size in interacting cylindrical nanodot arrays

TL;DR

This paper analytically investigates how dipolar interactions in cylindrical nanodot arrays influence vortex core size, revealing that alignment affects core radius variations with array parameters.

Contribution

It provides a novel analytical analysis of dipolar effects on vortex core size in nanodot arrays with different magnetic alignments.

Findings

Core radius decreases with dipolar coupling in parallel arrays.

Core radius increases with dipolar coupling in antiparallel arrays.

Core size varies with array size, interdot distance, and dot height.

Abstract

The effect of dipolar interactions among cylindrical nanodots, with a vortex-core magnetic configuration, is analyzed by means of analytical calculations. The cylinders are placed in a N x N square array in two configurations - core oriented parallel to each other and with antiparallel alignment between nearest neighbors. Results comprise the variation in the core radius with the number of interacting dots, the distance between them and dot height. The dipolar interdot coupling leads to a decrease (increase) of the core radius for parallel (antiparallel) arrays.