AC magnetic susceptibility study of a sigma-phase Fe65.9V34.1 alloy

TL;DR

This study investigates the complex magnetic phase transitions of a sigma-phase Fe-V alloy using AC susceptibility, revealing reentrant magnetic behavior with multiple transitions and weak inter-cluster coupling.

Contribution

It provides the first detailed AC susceptibility analysis of the magnetic phase diagram of sigma-phase Fe-V alloys, highlighting reentrant behavior and cluster interactions.

Findings

Identified two magnetic transitions at 312K and 302K.

Observed a low frequency dependence of the spin freezing temperature.

Revealed weak coupling between magnetic clusters.

Abstract

A sigma-phase Fe65.9V34.1 alloy was investigated with the AC magnetic susceptibility as a function of temperature, frequency and external magnetic field. An evidence was found that its magnetism shows features characteristic of a reentrant behavior viz. two transitions: first at TC ca.312K from the paramagnetic state into the collinear ferromagnetic one, and second at Tf ca.302K to a mixed state (sometimes termed as a ferromagnetic re-entrant spin glass) which, finally, at a lower temperature (TRSG ca.60K) transforms to a state where replica symmetry is broken. The frequency dependence of Tf is lower than that of canonical spin glasses, a feature, that in the light of a high concentration of magnetic carriers, can be understood in terms of a weak coupling between magnetic clusters.