Growth and characterization of multiferroic BiMnO$_3$ thin films

TL;DR

This paper reports the successful growth and detailed characterization of epitaxial multiferroic BiMnO$_3$ thin films, demonstrating their ferromagnetic and ferroelectric properties through various experimental techniques.

Contribution

It presents a novel method for growing high-quality BiMnO$_3$ thin films and provides comprehensive analysis of their multiferroic properties.

Findings

Films are epitaxial and stoichiometric

Ferromagnetic Curie temperature of 85 K

Clear ferroelectric hysteresis observed

Abstract

We have grown epitaxial thin films of multiferroic BiMnO$_3$ using pulsed laser deposition. The films were grown on SrTiO$_3$ (001) substrates by ablating a Bi-rich target. Using x-ray diffraction we confirmed that the films were epitaxial and the stoichiometry of the films was confirmed using Auger electron spectroscopy. The films have a ferromagnetic Curie temperature ($T_C$) of 85$\pm$5 K and a saturation magnetization of 1 $\mu_B$/Mn. The electric polarization as a function of electric field ($P-E$) was measured using an interdigital capacitance geometry. The $P-E$ plot shows a clear hysteresis that confirms the multiferroic nature of the thin films.