Micromagnetic modelling of nanorods array-based L10-FeNi/SmCo5 exchange-coupled composites

TL;DR

This study uses micromagnetic simulations to optimize the microstructure of L10-FeNi/SmCo5 nanorod arrays, revealing how anisotropy and structural parameters influence magnetic properties and energy product for high-performance magnets.

Contribution

It introduces a micromagnetic modeling approach to optimize nanorod array parameters for enhanced magnetic performance in exchange-coupled composites.

Findings

30% anisotropy misalignment causes only 10% coercivity drop

Optimal parameters: 40 nm diameter, 12-20 nm interrod distance

Energy product estimated at 149 kJ/m^3

Abstract

Exchange-coupled nanocomposites are considered as the most promising materials for production of high-energy performance permanent magnets, which can exceed neodymium ones in terms of energy product. In this work, micromagnetic simulations of L10-FeNi/SmCo5 composites based on the initially anisotropic structure of nanorods array were performed. Texturing effect on magnetic properties was investigated. It was revealed that even 30 % of anisotropy axes misalignment of grains in L10-FeNi phase would lead to only 10 % drop of coercivity. To maximize magnetic properties of the composites, parameters of microstructure were optimized for 120 x 120 array of interacting nanorods and were found to be 40 nm nanorod diameter and 12-20 nm interrod distance. The estimated diameter of nanorods and the packing density of the array provide energy product values of 149 kJ m-3. Influence of interrod distance on energy product values was explored. Approaches for production of exchange-coupled composites based on anisotropic nanostructures were proposed.