Thermodynamics of the SmCo5 compound doped with Fe and Ni: an ab initio study

TL;DR

This study uses ab initio methods to analyze how doping SmCo5 with Fe and Ni affects its thermodynamic stability and magnetic properties, aiming to improve the energy product of these permanent magnets.

Contribution

It introduces a new doped magnet, SmFe3CoNi, demonstrating enhanced stability and magnetic characteristics through first-principles calculations.

Findings

SmFe3CoNi is thermodynamically stable.

Doping modifies magnetic properties favorably.

Potential for improved energy product in permanent magnets.

Abstract

SmCo5 permanent magnets exhibit enormous uniaxial magnetocrystalline anisotropy energy and have a high Curie temperature. However, a low energy product presents a significant drawback in the performance of SmCo5 permanent magnets. In order to increase the energy product in SmCo5, we propose substituting fixed amount of cobalt with iron in a new magnet, SmFe3CoNi, where inclusion of nickel metal makes this magnet thermodynamically stable. We further discuss some basic theoretical magnetic properties of the SmCo5 compound.