Structure and lattice dynamics of heterostructures based on bismuth ferrite and barium strontium titanate on magnesium oxide substrates

• Published in: Physics of the solid state Vol. 52; no. 7; pp. 1432 - 1438
• Main Authors: Golovko, Yu. I., Mukhortov, V. M., Bunina, O. A., Zakharchenko, I. N., Anokhin, A. S., Shirokov, V. B., Yuzyuk, Yu. I.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-07-2010; Springer
• Subjects: Barium; Diffraction; Epitaxy; Iron compounds; Magnesium oxide; Magnetic alloys; Magnetism and Ferroelectricity; Physics; Physics and Astronomy; Solid State Physics; Strontium; X-rays; Barium Strontium Titanate Film; Barium Strontium Titanate; Ferrite; Raman Scattering Spectroscopy; Polarize Raman Spectrum
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783410070188

Bismuth ferrite films doped with neodymium on MgO single-crystal substrates with an epitaxial barium strontium titanate thin (1–2 nm) sublayer have been prepared by rf sputtering of ceramic targets at an elevated oxygen partial pressure and at temperatures below the ferroelectric and magnetic transition temperatures. It has been revealed using X-ray diffraction and Raman scattering spectroscopy that, in these bismuth ferrite films, a new phase (not observed in bulk samples) is formed. The symmetry of this phase is monoclinic, the unit cell contains two formula units, and the spontaneous polarization vector deviates from the [111]
cub
direction and can have different components along the
x, y
, and
z
axes.