SHG studies of multi-ferroelectricity of hexagonal rare-earth ferrite thin films

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Under this research project, the following three results were attained. (1)The coexistence of ferroelectricity and magnetic order in epitaxial hexagonal YbFeO3 thin films fabricated by the PLD method was experimentally found for the first time (published in J.Phys.Soc.Jpn. 2012) (2) Sn doped PbTiO3 thin films were successfully synthesized using a newly developed PLD method with three different ceramic targets. It was revealed that the films is a mixed state of SnTiO3, PbSnO3, and PbTiO3 and ferroelectrics with Tc of 277C. (3) The polar nature of twin boundaries (TBs) of inherently non-polar ferroelastic CaTiO3 was examined by the confocal SHG microscope. Three-dimensional SHG images confirmed that both crystallographically prominent TB and non-prominent TB are SHG active and consequently polar. The point group symmetries of the TBs and directions of the electric polarization are determined from the anisotropy of SHG intensities (published in Phys.Rev.B 2014).