Relationship between the magnetic hyperfine field and the magnetic moment

TL;DR

The paper demonstrates that the relationship between the magnetic hyperfine field and magnetic moment varies across different alloys and compounds, showing multiple branches and dependence on composition and lattice site, thus challenging the assumption of a universal proportionality.

Contribution

It reveals that the hyperfine field-moment relationship is not universal but depends on specific alloy or compound characteristics, highlighting the complexity of magnetic interactions.

Findings

Multiple branches in Bhf-m plots for different alloys.

Hyperfine coupling constant varies with composition and lattice site.

Scaling Bhf to m cannot be universally applied.

Abstract

Based on experimental data it is shown, for some chosen alloys and compounds of iron, that there is no one unique relationship between the 57Fe-site magnetic hyperfine field, Bhf, and the magnetic moment per Fe atom, m. Instead, the Bhf-m plot consists of several branches, each of them being characteristic of a given alloy or compound. Consequently, the effective proportionality constant (hyperfine coupling constant) depends on the alloy system or compound, and for a given alloy system or compound it depends on the composition or even on the lattice site. Consequently, the scaling of Bhf into the underlying m cannot be done a priopri.