Emergence of ferroelectric switching in self organized Pr0.67Ca0.33MnO3 nanocrystal array

We discuss the emergence of low dimensional ferroelectricity in self-organized Pr0.67Ca0.33MnO3 nanocrystalline arrays deposited on Si substrate. We observe sharp switching of electric polarization under external electric eld with nearly rectangular hysteresis loops which persist up to 150 K. We discuss the polarization switching kinetics within the framework of Kolmogorov-Avrami-Ishibashi Model which gives maximum domain wall speed of ~1 m/s. Polarized Raman spectroscopy shows evidence of isolated ferroelectric domains even at room temperature.