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

摘要

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