Coercivity reduction in a two-dimensional array of nano-particles

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.

Dipolar Interaction and Sample Shape Effects on the Hysteresis Properties of 2d Array of Magnetic Nanoparticles

“…They found that coercivity increases with arrays disorder. (c) Using the Landau-Lifshitz-Gilbert approach, Morales-Meza et al studied the magnetization reversal in a two-dimensional array of MNPs [28]. They showed that coercivity is reduced even if the particle position in the array is random.…”