Ab-Initio Study on the Hard Magnetic Properties of MnBi

TL;DR

This study uses first-principles calculations to analyze the magnetic properties of MnBi, revealing temperature-dependent differences in unit cell configurations and their impact on magnetic anisotropy.

Contribution

It provides a detailed ab-initio analysis of MnBi's magnetic properties, highlighting the importance of unit cell configuration and temperature effects.

Findings

MnBi configuration is more accurate near 0K.

BiMn configuration fits better above 300K.

Magneto-crystalline anisotropy energy peaks at 2.3 MJ/m³.

Abstract

We have studied the hard magnetic properties of the low-temperature phase of MnBi with first principle calculations based on the density functional theory. The calculations have been carried out on two distinct unit cell configurations MnBi and BiMn with the element in the unit cell origin named first. Our results show that these configurations are not equivalent and that MnBi describes the system better near T = 0K and the BiMn configuration describes the system better for T > 300K. The magnetic moments of both configurations agree well with experimental measurements considering both spin and orbital contributions. At high temperatures the magneto-crystalline anisotropy energy increases with increasing unit cell volume and reaches a maximum of 2:3MJ=m3 and a c=a ratio of 1:375.