Multiglass properties and magnetoelectric coupling in uniaxial anisotropic spin-cluster-glass Fe2TiO5

TL;DR

This study investigates the multiglass and magnetoelectric properties of Fe2TiO5, revealing complex dielectric behavior, electric polarization, and evidence of magnetoelectric coupling at temperatures above 77 K, linked to its spin-glass nature.

Contribution

It provides new insights into the magnetoelectric coupling and multiglass behavior in uniaxial anisotropic spin-cluster-glass Fe2TiO5, especially at higher temperatures.

Findings

Magnetodielectric behavior varies across magnetic transition temperatures.

Electric dipoles exhibit glassy dynamics at 100-150 K.

High remnant polarization observed at 10 K.

Abstract

The compound, Fe2TiO5 (FTO)is a well-known uniaxial anisotropic spin-glass insulator with two successive glassy freezing temperatures i.e. transverse (TTF= 9K) and longitudinal (TLF= 55 K). In this article, we present the results of measurements of complex dielectric behavior, electric polarization as a function of temperature (T), in addition to characterization by magnetic susceptibility and heat-capacity, primarily to explore magnetoelectric (ME) coupling and multiglass properties in uniaxial anisotropic spin cluster-glass FTO. The existence of two magnetic transitions is reflected in the isothermal magnetodielectric (MD) behavior in the sense that the sign of MD is different in the T regime T<TTF and T>TTF.The data in addition provide evidence for the glassy dynamics of electric-dipoles; interestingly, this occurs at much higher temperature (~100-150 K) than TLF with high remnant polarization at 10 K( 4000 micro C/m2) attributable to short-range magnetic correlations, thereby offering a route to attain ME coupling above 77 K.