Influence of shape, size and volume fraction of phase on the magnetic properties of Nd2Fe14B/α″-Fe16N2 core–shell nanostructures magnets

Abstract

Finite difference method was used to perform micromagnetic simulation of Nd2Fe14B/α˝-Fe16N2 nanocomposite magnets with core–shell structures. Their magnetic properties and magnetization reversal processes were systematically studied by changing the shape, shell size, and volume fraction of the soft phase. Numerical results indicate that compared with the square and cylindrical nanocomposites, the spherical core–shell system has the largest magnetic energy product. This nanocomposite magnets can exhibit the maximum energy product of 811.84 kJ/m3. In addition, compared with the noncollinear configuration of the external field with easy axis, the core–shell nanostructure magnets show the optimal magnetic properties and the largest magnetic energy product when the applied magnetic field was along the easy axis. Our results were useful in synthesizing or designing magnetic nanocomposites with excellent properties.