Simulation of dislocations imaged moirfringe contrast

Transemission electron microscope (TEM) images of dislocations as produced via moirfringe contrast are simulated using manybeam diffraction theory. The effect of edge dislocations on both parallel and rotational moirfringe patterns is considered. For the parallel moirfringe pattern, images of dislocations both perpendicular to the film plane and those inclined to the film plane are produced. The effect of an inclined dislocation is shown to cause a distortion of the dislocation image. Finally, a comparison between predicted and experimentally observed images is made, with the results indicating that threating dislocations in the FeAl/GaAs system have line directions nearly perpendicular to the (001)_FeAl/GaAs film plane.1993 WileyLiss, Inc. Copyright1993 WileyLiss, Inc.