TY - JOUR
T1 - Stability of Polar Vortex Lattice in Ferroelectric Superlattices
JF - Nano Letters
Y1 - 2017/
SP - 2246
EP - 2252
A1 - Z. Hong
A1 - A.R. Damodaran
A1 - F. Xue
A1 - S.-L. Hsu
A1 - J. Britson
A1 - A.K. Yadav
A1 - C.T. Nelson
A1 - J.-J. Wang
A1 - J.F. Scott
A1 - L.W. Martin
A1 - Ramamoorthy Ramesh
A1 - L.-Q. Chen
KW - Article
KW - competition
KW - Crystal lattices
KW - Ferroelectric superlattice
KW - ferroelectricity
KW - Geometric length
KW - Neodymium compounds
KW - Phase-field simulation
KW - Polar vortex
KW - Polarization
KW - simulation
KW - Superconducting materials
KW - Topological structure
KW - Topology
KW - Vortex flow
AB - A novel mesoscale state comprising of an ordered polar vortex lattice has been demonstrated in ferroelectric superlattices of PbTiO3/SrTiO3. Here, we employ phase-field simulations, analytical theory, and experimental observations to evaluate thermodynamic conditions and geometric length scales that are critical for the formation of such exotic vortex states. We show that the stability of these vortex lattices involves an intimate competition between long-range electrostatic, long-range elastic, and short-range polarization gradient-related interactions leading to both an upper and a lower bound to the length scale at which these states can be observed. We found that the critical length is related to the intrinsic domain wall width, which could serve as a simple intuitive design rule for the discovery of novel ultrafine topological structures in ferroic systems. © 2017 American Chemical Society.
PB - American Chemical Society
VL - 17
N1 - cited By 36
ER -