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Ferroelectric Property Dependence on the Texture of SrBi2Ta2O9 Thin Films

ABSTRACT SrBi2Ta2O9 (SBT) thin films with different textures were fabricated by pulsed laser deposition under different deposition conditions. The influence of the deposition condition on the texture of the SBT films can be explained by the interactions between the plume and the substrate. With the aid of x-ray diffractometry, piezoreponse scanning probe microscopy, and ferroelectric-property measurements, a correlation between the film texture, as well as the domain structure, and the ferroelectric properties was established. It was found that the ferroelectrics properties, such as the polarization and the coercive field, had a strong dependence on the texture of the SBT films. What's more, 90° domains were observed in the (115)-textured SBT films. These results are of interest for the fabrication of ferroelectric memories with fatigue free SBT thin films.