@article{588d3ebd2cd848d59c2c9c5a31ac1b25,
title = "Influence of interfacial dislocations on hysteresis loops of ferroelectric films",
abstract = "We investigated the influence of dislocations, located at the interface of a ferroelectric film and its underlying substrate, on the ferroelectric hysteresis loop including the remanent polarization and coercive field using phase-field simulations. We considered epitaxial ferroelectric BaTiO3 films and found that the hysteresis loop is strongly dependent on the type and density of interfacial dislocations. The dislocations that stabilize multiple ferroelectric variants and domains reduce the coercive field, and consequently, the corresponding remanent polarization also decreases.",
author = "Li, \{Y. L.\} and Hu, \{S. Y.\} and S. Choudhury and Baskes, \{M. I.\} and A. Saxena and T. Lookman and Jia, \{Q. X.\} and Schlom, \{D. G.\} and Chen, \{L. Q.\}",
note = "Funding Information: This work was supported by the Laboratory-Directed Research and Development Program under DOE at Los Alamos National Laboratory, NSF under Grant Nos. DMR-0507146 and DMR-0820404, and the Department of Energy under Grant No. DE-FG02-07ER46417. FIG. 1. Schematic illustrations of simulated models: (a) misfit dislocation with b s = [ − 100 ] and n s = ( 100 ) , (b) misfit dislocation with b s = [ 100 ] and n s = ( 100 ) , (c) threading dislocation with b s = [ 1 − 10 ] and n s = ( 111 ) , and (d) threading dislocation with b s = [ 10 − 1 ] and n s = ( 111 ) . FIG. 2. (a) Hysteresis loops for BaTiO 3 films with different types of interfacial dislocations. (b) Domain morphologies at the points shown in (a). Each color represents one type of domain. The corresponding polarization is indicated in the figures. FIG. 3. Hysteresis loops for BaTiO 3 films with different densities of type (a) and type (b) interfacial misfit dislocations. The notation of 2 × ( a ) indicates that two dislocations of type (a) distribute uniformly along the x 1 -direction. The notation of ( a ) + ( b ) indicates that one dislocation of type (a) is along the x 1 -direction and one dislocation of type (b) is along the x 2 -direction, respectively. The other notations have similar meanings. ",
year = "2008",
doi = "10.1063/1.3021354",
language = "English (US)",
volume = "104",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics",
number = "10",
}