An investigation into the use of intensity observations in the electron microscope for determining magnetic domain wall widths in thin foils

Abstract

The contrast to be expected from several magnetic domain walls of interest is discussed in the limiting case of a parallel incoherent electron beam. The effect of a finite beam divergence and coherency content of the illuminating beam are then considered and it is shown that before a complete calculation of the coherency effect is undertaken, the best measurement of domain wall widths is to be obtained from divergent walls. Corrections for beam divergence effects are presented in detail.