Figure 1
From: Development of very high Jc in Ba(Fe1-xCox)2As2 thin films grown on CaF2

TEM cross sections of Co-Ba122 thin films on CaF2.
(a) Single-layer Co-Ba122 film with a very clean microstructure with only threading dislocations and few stacking faults. (b) Multilayer Co-Ba122 films with short c-axis nanorods, round nanoparticles and ab-arranged precipitates: this sample present a defects gradient across the thickness. (c) High magnification of the few defects present in the multilayer film shown in (b).