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

TL;DR

This paper reports the discovery of ferroelectric switching in self-organized Pr0.67Ca0.33MnO3 nanocrystal arrays, demonstrating sharp polarization switching and ferroelectric domains up to room temperature, with potential implications for nanoelectronic devices.

Contribution

It presents the emergence of ferroelectricity in a nanocrystalline manganite array and analyzes its switching kinetics and domain behavior.

Findings

Sharp polarization switching with rectangular hysteresis loops up to 150 K.

Evidence of ferroelectric domains at room temperature from Raman spectroscopy.

Maximum domain wall speed estimated at ~1 m/s.

Abstract

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.