Infrared and magnetic characterization of the multiferroic Bi2FeCrO6 thin films in a broad temperature range

Abstract

Infrared reflectance spectra of an epitaxial Bi2FeCrO6 thin film prepared by pulsed laser deposition on LaAlO3 substrate were recorded between 10 and 900 K. No evidence for a phase transition to the paraelectric phase was observed, but some phonon anomalies were revealed near 600 K. Most of the polar modes exhibit only a gradual softening, which results in a continuous increase of the static permittivity on heating. It indicates that the ferroelectric phase transition should occur somewhere above 900 K. Magnetic measurements performed up to 1000 K, revealed a possible magnetic phase transition between 600 and 800 K, but the exact critical temperature cannot be determined due to a strong diamagnetic signal from the substrate. Nevertheless, our experimental data show that the B-site ordered Bi2FeCrO6 is one of the rare high-temperature multiferroics.

arXiv commentsubm. to PRB

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Cited by in corpus (6)

• Epitaxial thin films of the multiferroic double perovskite Bi2FeCrO6 grown on (100)-oriented SrTiO3 substrates: Growth, characterization, and optimization
• Far infrared and terahertz spectroscopy of ferroelectric soft modes in thin films: A review
• Magnetism and electronic properties of BiFeO3 under lower pressure
• Electronic structure and magnetic and optical properties of double perovskite Bi2FeCrO6 from first-principles investigation
• Electronic origin of spin-phonon coupling effect in transition-metal perovskites
• High-Curie-temperature ferrimagnetism and ferroelectricity in Bi2FeMoO6