Magnetocapacitive La0.6Sr0.4MnO3 0.7Pb(Mg0.33Nb0.67)O3 0.3PbTiO3 epitaxial heterostructures

TL;DR

This study reports the fabrication of epitaxial heterostructures combining ferromagnetic and ferroelectric layers, demonstrating magnetocapacitance influenced by multiple coupling mechanisms, with potential implications for multifunctional device applications.

Contribution

First demonstration of magnetocapacitance in La0.6Sr0.4MnO3-Pb(Mg0.33Nb0.67)O3-PbTiO3 heterostructures fabricated by pulsed laser ablation, highlighting strain and magnetoresistance effects.

Findings

Capacitance varies with magnetic field.

Magnetocapacitance depends on magnetic field, temperature, and frequency.

Multiple mechanisms contribute to observed properties.

Abstract

Epitaxial heterostructures of La0.6Sr0.4MnO3 0.7Pb(Mg0.33Nb0.67)O3 0.3PbTiO3 were fabricated on LaNiO3 coated LaAlO3 (100) substrates by pulsed laser ablation. Ferromagnetic and ferroelectric hysteresis established their biferroic nature. Dielectric behviour studied under different magnetic fields over a wide range of frequency and temperatures revealed that the capacitance in these heterostructures varies with the applied magnetic field. Appearance of magnetocapacitance and its dependence on magnetic fields, magnetic layer thickness, temperature and frequency indicated a combined contribution of strain mediated magnetoelectric coupling, magnetoresistance of the magnetic layer and Maxwell Wagner effect on the observed properties.