Dynamic control of ferroionic states in ferroelectric nanoparticles

Center‐Type Topological Domain States in Ferroelectric Nanodots Tailored from Thin Films

“…Understanding boundary conditions is critical in revealing the nanoscale physics of multiferroics, which may be electrical, such as imperfect screening; chemical, such as chemical bonding; or mechanical, such as strain. [1][2][3][4][5][6][7][8][9][10] In particular, the role of strain in the formation of domain states is of theoretical and practical significance. [11][12][13] For bulk ferroelectric ceramics, the ferroelectric phase transition temperature is assumed to decrease under constant pressure Gibbs conditions, and the application of hydrostatic pressure significantly improves dielectric and piezoelectric performance.…”

“…[16] Despite extensive studies into the strain phenomena of ferroelectrics, challenges still exist in modeling the strain effect, owing to the geometric configuration of nanoferroelectrics. [5,11,[17][18][19] Furthermore, the study of the fabrication of BiFeO 3 (BFO) nanostructures with strain has shown that the eight polarization variants of the rhombohedral BFO cell, geometry constraints, and strain tuning are conducive to forming topological defects. [20][21][22][23][24] However, quantitative experimental investigations of the exotic domain states are needed for smaller nanodots, which require piezoresponse force microscopy (PFM).…”