Solution Processed Large-scale Multiferroic Complex Oxide Epitaxy with Magnetically Switched Polarization

TL;DR

This paper reports the development of solution-based large-scale epitaxy of multiferroic complex oxides with tunable properties, demonstrating room-temperature magnetoelectric coupling and potential for industrial applications.

Contribution

It introduces a novel solution processing method for high-quality, large-area multiferroic oxide epitaxy with tunable ferroelectric and magnetic properties.

Findings

Achieved ferroelectricity with spontaneous polarization of 79-89 μC/cm².

Realized bulk magnetization of ~0.07 μB/Fe at room temperature.

Observed large magnetoelectric coupling with a coefficient of 2.7-3.0×10⁻⁷ s/m.

Abstract

Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single crystalline epitaxy for multiferroic (1-x)BiTi(1-y)/2FeyMg(1-y)/2O3-(x)CaTiO3 (BTFM-CTO) solid solution in large area, confirming its ferroelectricity at atomic-scale with a spontaneous polarization of 79~89uC/cm2. Careful compositional tuning leads to a bulk magnetization of ~0.07uB/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7-3.0X10-7s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM-CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.