  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.
