A model for Lorentz microscopy and magnetic behaviour of longitudinal thin film with an irregular lattice

Lorentz microscopy is an important experimental technique currently being used to investigate magnetic microstructures found in longitudinal thin films. Micromagnetic models of thin films have previously been based on regular hexagonal lattices; a Monte-Carlo algorithm has been developed which produces an irregular structure with a grain size distribution. We model Lorentz microscopy by integrating the in-plane components of the stray field along a straight line trajectory. The effects of packing fraction and structure regularity on the remanence and coercivity values are discussed; we show that regularity has a qualitative effect on the simulated Lorentz images of coercive states. >