Coercivity reduction in a two-dimensional array of nanoparticles

TL;DR

This paper theoretically investigates how arranging ferromagnetic nanoparticles in specific two-dimensional patterns can significantly reduce coercivity, with optimal spacing and robustness to positional disorder, enhancing magnetic performance.

Contribution

It introduces a numerical approach to optimize nanoparticle arrangements for coercivity reduction, demonstrating a ~30% decrease and robustness to positional randomness.

Findings

Optimal particle spacing reduces coercivity by ~30%.

Triangular arrangements tolerate up to 20% positional disorder.

Coercivity reduction is achievable even with imprecise particle placement.

Abstract

We report on theoretical investigation of the magnetization reversal in two-dimensional arrays of ferromagnetic nano-particles with parameters of cobalt. The system was optimized for achieving the lowest coercivity in an array of particles located in the nodes of triangular, hexagonal and square grids. Based on the numerical solution of the non-stochastic Landau-Lifshitz-Gilbert equation we show that each particle distribution type is characterized with a proper optimal distance, allowing to lower the coercivity values for approximately 30% compared with the reference value obtained for a single nano-particle. It was shown that the reduction of coercivity occurs even if the particle position in the array is not very precise. In particular, the triangular particle arrangement maintained the same optimal distance between the particles under up to 20% random displacements of their position within the array.