Fig. 6: Control over the La3+ arrangement and ferroelectric/antipolar phase coexistence in a capacitor device.
From: Reversible control over the distribution of chemical inhomogeneities in multiferroic BiFeO3
a–c Optical SHG images of a SrRuO3/La0.15Bi0.85FeO3/Co90Fe10 capacitor after a 104 ferroelectric-switching events, b subsequent application of 140 μN, and c consecutive 104 ferroelectric-switching events. The dashed white circle outlines the electrode region with a diameter of 20 μm. Bright regions correspond to high SHG emission and, therefore, denote the presence of a macroscopic polarization. The regions with low SHG intensity within the capacitor area indicate low net in-plane polarization due to incomplete training. Schematics of the ferroelectric-switching and force-application experiments are depicted below the respective SHG micrograph. The color of the La0.15Bi0.85FeO3 in the sketches denotes its pristine ferroelectric (purple), force-induced antipolar (light blue), and consecutively poled ferroelectric (light green) phases.
