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

Prokhorov, VG; Kaminsky, GG; Kim, JM; Yoo, YJ; Lee, YP; Svechnikov, V.; Levchenko, GG; Nikolaenko, YM

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

Journal article (2012)

Authors

VG Prokhorov External organisation

GG Kaminsky External organisation

JM Kim External organisation

YJ Yoo External organisation

YP Lee External organisation

V. Svechnikov

GG Levchenko External organisation

YM Nikolaenko External organisation

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Published Date

2012

Language

English

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Abstract

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