Magnetocapacitance effect in perovskite-superlattice based multiferroics

TL;DR

This study investigates the magnetoelectric properties of La0.7Ca0.3MnO3/BaTiO3 superlattices, demonstrating significant magnetoresistance and magnetocapacitance effects that highlight their potential for multifunctional device applications.

Contribution

It reports the structural, magnetic, and magnetoelectric properties of perovskite superlattices, revealing notable magnetocapacitance and magnetoresistance effects driven by magnetic field and layer thickness.

Findings

Magnetoresistance up to 30% at 100K dependent on BaTiO3 thickness

Negative magnetocapacitance as high as 3% per Tesla at 100K

Clear magnetoelectrical coupling observed in impedance and capacitance measurements

Abstract

We report the structural and magnetoelectrical properties of La$_{0.7}$Ca$_{0.3}$MnO$_3$/BaTiO$_3$ perovskite superlattices grown on (001)-oriented SrTiO$_3$ by the pulsed laser deposition technique. Magnetic hysteresis loops together with temperature dependent magnetic properties exhibit well-defined coercivity and magnetic transition temperature (T$_C$) \symbol{126}140 K. $DC$ electrical studies of films show that the magnetoresistance (MR) is dependent on the BaTiO$_3$ thickness and negative $MR$ as high as 30% at 100K are observed. The $AC$ electrical studies reveal that the impedance and capacitance in these films vary with the applied magnetic field due to the magnetoelectrical coupling in these structures - a key feature of multiferroics. A negative magnetocapacitance value in the film as high as 3% per tesla at 1kHz and 100K is demonstrated, opening the route for designing novel functional materials.