Exchange Interaction in Fe$_{1-x}$Ni$_{x}$Alloys: XPS Study

TL;DR

This study uses high-resolution XPS to analyze exchange interactions and local magnetic moments in Fe-Ni alloys at low temperatures, revealing detailed electronic and magnetic properties.

Contribution

It provides new insights into the exchange interactions and magnetic moments in Fe$_{1-x}$Ni$_{x}$ alloys using XPS at low temperatures.

Findings

Fe 2s core level shows exchange interaction features

High local magnetic moments on Fe sites

Screening of 2s core hole by conduction electrons

Abstract

In this paper, high Fe-concentration Fe$_{1-x}$Ni$_{x}$ alloys were investigated using high resolution X-ray photoelectron spectroscopy (XPS) down to 10K temperature. The Fe 2s core level exhibits three features, two low binding features corresponding to exchange interaction between ionized 2s core level and the unpaired 3d electrons. The high binding energy feature corresponds to the screening of 2s core hole by 4s conduction electrons. Our studies suggest high local magnetic moments on Fe sites.