Посилання: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.
Підтримка:This work was supported by the NRF/MEST through
the Quantum Photonic Science Research Center, Korea.
V. Svetchnikov is grateful to the financial support of the
Netherlands Institute for Metal Research.
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.