Room temperature ferroelectric, ferromagnetic and magnetoelectric properties of Ba-doped BiFeO3 thin films

• Published in: Journal of physics. D, Applied physics Applied physics, 2007-03, Vol.40 (6), p.1603-1607
• Main Authors: Li, Meiya, Ning, Min, Ma, Yungui, Wu, Qibin, Ong, C K
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Ferroelectricity and antiferroelectricity; Magnetic properties and materials; Magnetomechanical and magnetoelectric effects, magnetostriction; Physics
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/40/6/002

Ba-doped multiferroic BiFeO3thin films were successfully prepared on Pt/TiO2/SiO2/Si(1 0 0) substrates by pulsed laser deposition. X-ray diffraction showed that the Bi0.75Ba0.25FeO3thin film was single phase with (1 0 1) preferential polycrystalline orientation. Both ferroelectricity and ferromagnetism of these films were observed at room temperature by P-E and M-H loop measurements, respectively. The magnetoelectric coupling effect was demonstrated by measuring the dielectric constant in a varying magnetic field. The dielectric constants measured at 10 kHz increased with an increase in the applied magnetic field, giving a coupling coefficient (epsilonr (H) - epsilonr (0))/epsilonr (0) of 1.1% at H = 8 kOe at room temperature, which shows potential application.