Ferroelectric properties of the epitaxial PbTiO3 thin films

Thin films of PbTiO3 (PT) were hetero-epitaxially grown on the sapphire, Sr TiO3, and MgO substrates by the magnetron sputtering. The structural proper ties and ferroelectric properties were evaluated. The heteroepitaxial thin films show strained and/or unstrained structure. These structural propertie s affected the ferroelectric properties of the sputterd thin films. The fer roelectric behaviour of the unstrained epitaxial PT thin films is similar t o that of bulk ceramics. Strained PT thin films of single domain/single cry stal structure showed a diffused temperature anomaly at the tetra-cubic tra nsition.