Magnetic exchange coupling and Curie temperature of Ni(1+x)MnSb (x=0, 0.25, 0.5, 0.75, 1) from first principles

TL;DR

This study uses first-principles calculations to analyze how varying Ni concentration in Ni(1+x)MnSb affects magnetic interactions and Curie temperature, revealing a decrease in Tc with more Ni, consistent with experimental data.

Contribution

It provides a detailed first-principles analysis of magnetic properties across different Ni concentrations in Ni(1+x)MnSb, using super-cell and frozen-magnon methods.

Findings

Curie temperature decreases as Ni content increases

Exchange interactions depend on Ni concentration

Results agree with experimental observations

Abstract

We study the dependence of magnetic interactions and Curie temperature in Ni(1+x)MnSb system on the Ni concentration within the framework of the density-functional theory. The calculation of the exchange parameters is based on the super-cell and frozen-magnon approaches. The Curie temperatures, Tc, are calculated within the random-phase approximation. In agreement with experiment we obtain decrease of the Curie temperature with increasing Ni content.