Threading dislocation lines in two-sided flux-array decorations

Threading dislocation lines in two-sided flux array decorations

Two-sided flux decoration experiments indicate that threading dislocation lines (TDLs), which cross the entire film, are sometimes trapped in metastable states. We calculate the elastic energy associated with the meanderings of a TDL. The TDL behaves as an anisotropic and dispersive string with thermal fluctuations largely along its Burger’s vector. These fluctuations also modify the structure ...

Theory of double-sided flux decorations.

A novel two-sided Bitter decoration technique was recently employed by Yao et al. to study the structure of the magnetic vortex array in high-temperature superconductors. Here we discuss the analysis of such experiments. We show that two-sided decorations can be used to infer quantitative information about the bulk properties of flux arrays, and discuss how a least squares analysis of the local...

Threading dislocation reduction in strained layers

In this article, we have developed models for threading dislocation ~TD! reduction due to the introduction of an intentionally strained layer. Three different types of dislocations have been considered in this model: misfit dislocations ~MDs!, mobile TDs, and TDs whose glide motion has been blocked by a MD crossing the glide path of the TD ~immobile TDs!. The models are based on MD formation by...

An approach to threading dislocation ‘‘reaction kinetics’’

An approach is developed to describe the evolution of threading dislocation ~TD! densities in lattice-mismatched epitaxial films. TD ensembles are treated in close correspondence to chemical species in chemical reaction kinetics. ‘‘Reaction rate’’ equations are derived for changing TD density with increasing film thickness for firstand second-order reactions. Selective area growth is an example...

Flux Qubits and Readout Device with Two Independent Flux Lines