Electrical, magnetic, magnetodielectric and magnetoabsorption studies in multiferroic GaFeO3

TL;DR

This study investigates the electrical, magnetic, magnetodielectric, and magnetoabsorption properties of polycrystalline GaFeO3, revealing magnetoelectric coupling and potential for multiferroic device applications.

Contribution

It provides comprehensive experimental insights into GaFeO3's multiferroic properties, highlighting magnetoelectric coupling and magnetic behavior across temperatures.

Findings

Anomaly in permittivity near ferrimagnetic transition at 228 K.

Magnetoelectric coupling indicated by permittivity change under magnetic field.

Strong temperature-dependent coercivity and correlation with magnetoabsorption shifts.

Abstract

We report electrical, magnetic, magnetodielectric and magnetoabsorption properties of a polycrystalline GaFeO3. The resistivity measurement shows that the sample is highly insulating below 200 K and the resistivity above 200 K obey the Arrhenius law with an activation energy of Ea = 0.67 eV. An anomaly occurs in the temperature dependence of permittivity (e) near the ferrimagnetic transition temperature (TC = 228 K) in a zero magnetic field and it is suppressed under H = 60 mT which indicates a possible magnetoelectric coupling in GaFeO3 with a fractional change of de/e = -1.8% at 60 mT around TC. The coercivity (HC) of the sample increases dramatically with lowering temperature below 200 K from 0.1 T at 200 K to 0.9 T at 5 K. Magnetoabsorption was studied with a LC resonance technique and we found a close correlation between the shift in the resonance frequency due to applied magnetic field and the coercive field measured using dc magnetization measurements. Our results obtained with multiple techniques suggest that GaFeO3 is an interesting ferrimagnet with potential applications in future multiferroic devices.