Composition Dependence of Structural Parameters and Properties of Gallium Ferrite

TL;DR

This study investigates how varying the composition of gallium ferrite affects its structural and magnetic properties, revealing linear lattice parameter changes, bond stretching, and a maximum coercivity at a specific Fe ratio.

Contribution

It provides detailed analysis of composition-dependent structural and magnetic parameters of Ga-Fe ferrite, including Vegard's law validation and magnetic behavior insights.

Findings

Lattice parameters vary linearly with Fe content.

Raman shifts indicate bond stretching with increased Fe.

Maximum coercivity occurs at a Ga:Fe ratio of 1:1.

Abstract

We show the effect of composition on structural and magnetic characteristics of pure phase polycrystalline Ga<2-x>Fe<x>O<3> (GFO) for compositions between 0.8 <= x <= 1.3. X-ray analysis reveals that lattice parameters of GFO exhibit a linear dependence on Fe content in single phase region indicating manifestation of Vegard's law. Increasing Fe content of the samples also leads to stretching of bonds as indicated by the Raman peak shifts. Further, low temperature magnetic measurements show that the coercivity of the samples is maximum for Ga:Fe ratio of 1:1 driven by a competition between decreasing crystallite size and increasing magnetic anisotropy.