Evidence for Griffiths phase in multiferroic BiMnO₃ and BiFe₀.₅Mn₀.₅O₃ films

• Published in: Физика низких температур
• Date: 2012
• Main Authors: Prokhorov, V.G., Kaminsky, G.G., Kim, J.M., Yoо, Y.J., Lee, Y.P., Svetchnikov, V.L., Levchenko, G.G., Nikolaenko, Yu.M., Khokhlov, V.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Subjects: Низкотемпеpатуpный магнетизм
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117188
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Evidence for Griffiths phase in multiferroic BiMnO₃ and BiFe₀.₅Mn₀.₅O₃ films / V.G. Prokhorov, G.G. Kaminsky, J.M. Kim, Y.J. Yoo, Y.P. Lee , V.L. Svetchnikov, G.G. Levchenko, Yu.M. Nikolaenko, V.A. Khokhlov // Физика низких температур. — 2012. — Т. 38, № 5. — С. 531-537. — Бібліогр.: 30 назв. — англ.

Microstructure and magnetic properties of the BiMnO₃ and BiFe₀.₅Mn₀.₅O₃ films, prepared by the rf magnetron sputtering on LaAlO₃ (001) single-crystalline substrate, have been investigated. The selected-area electron diffraction analysis allows us to indentify the crystal structure of the BiMnO₃ film as an orthorhombic one while the BiFe₀.₅Mn₀.₅O₃ film has a hexagonal lattice symmetry. The high-resolution electron microscopy study reveals the presence of strip-domain phase with a periodic spacing of about 3c in both films. The magnetic measurements show that in addition to the basic paramagnetic phase, the films manifest the Griffiths phase behavior in a wide temperature range. We argue that the observed weak ferromagnetism is provided by an appearance of the strip-domain layered inclusions rather than the intrinsic physical origin of the films.