Accommodation of transformation strains in transverse multiferroic nanostructures CoFe2O4–PbTiO3

Variable-temperature x-ray diffraction was used to investigate the internal strains that arise from a ferroelectric phase transition in self-assembled multiferroic nanostructures CoFe2O4–PbTiO3 on (001) SrTiO3. The constraints from CoFe2O4 suppressed the c∕a ratio in tetragonal PbTiO3 (without affec...

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Bibliographic Details
Published in:Applied physics letters 2007-08, Vol.91 (6)
Main Authors: Levin, Igor, Slutsker, Julia, Li, Jianhua, Tan, Zhuopeng, Roytburd, Alexander L.
Format: Article
Language:English
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Summary:Variable-temperature x-ray diffraction was used to investigate the internal strains that arise from a ferroelectric phase transition in self-assembled multiferroic nanostructures CoFe2O4–PbTiO3 on (001) SrTiO3. The constraints from CoFe2O4 suppressed the c∕a ratio in tetragonal PbTiO3 (without affecting its Curie temperature) while the expansion of the out-of-plane lattice parameter in PbTiO3 upon the transition induced tensile out-of-plane strain in CoFe2O4. The transformation strain was partly relieved by the 90° twin domains in PbTiO3 which reduced the net deformation of the component phases. Significant fractions of both c- and a-domains were observed despite the nanoscale of PbTiO3 in the composite films.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2768890