Orthorhombic polar Nd-doped BiFeO3 thin film on MgO substrate

I. N. Leontyev (1, 2) , Yu I. Yuzyuk (3, 2) , P.-E. Janolin (1) , Mimoun El Marssi (3) , D. Chernyshov (4) , V. Dmitriev (4) , Yu I. Golovko (5) , V. M. Mukhortov (5) , Brahim Dkhil (1)

1 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides
2 SFEDU - Southern Federal University [Rostov-on-Don]
3 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
4 ESRF - European Synchrotron Radiation Facility
5 Southern Scientific Centre of RASci

A Nd-doped BiFeO3 thin film deposited on MgO substrate was studied by synchrotron diffraction. The ferroelectric nature of the film is proven by in-plane remanent polarization measurement. The highest possible symmetry of the film is determined to be orthorhombic, within the Fm2m space group. Such a structure is rotated by 45 degrees with respect to the substrate and is consistent with tilts of oxygen octahedra doubling the unit cell. This polar structure presents a rather unusual strain-accommodation mechanism.

Domaines: Matériaux

I. N. Leontyev, Yu I. Yuzyuk, P.-E. Janolin, Mimoun El Marssi, D. Chernyshov, et al.. Orthorhombic polar Nd-doped BiFeO3 thin film on MgO substrate. Journal of Physics: Condensed Matter, 2011, 23 (33), ⟨10.1088/0953-8984/23/33/332201⟩. ⟨hal-02186455⟩