Nonlinear magnetoelastic behavior of the metastable bcc phases Co and Ni: Importance of third-order contributions for bcc Ni

TL;DR

This paper investigates the nonlinear magnetoelastic properties of metastable bcc Co and Ni, highlighting the crucial role of third-order effects especially in bcc Ni, using a combination of phenomenological theory and ab-initio calculations.

Contribution

It introduces a combined theoretical approach to calculate nonlinear magnetoelastic coefficients for metastable bcc Co and Ni, emphasizing the importance of third-order contributions in bcc Ni.

Findings

Magnetoelastic behavior of bcc Co and Ni differs significantly from fcc phases.

Third-order magnetoelastic effects are essential for accurately describing bcc Ni.

The study provides detailed coefficients for the nonlinear magnetoelastic response.

Abstract

The first- and second-order magnetoelastic coefficients of the metastable bcc phases Co and Ni are calculated by using a combination of the phenomenological theory of nonlinear magnetoelasticity with the ab-initio density functional electron theory. The magnetoelastic behavior of the bcc phases is drastically different from that of the corresponding fcc phases. The recently synthesized bcc phase of Ni appears to be an example of a material for which third-order magnetoelastic effects are essential.