Abstract
The magnetic domain structure of a single crystal of Co (0001) and of polycrystalline AlNiCo was investigated in a photoelectron emission microscope making use of partial restriction of the electron beams. An external movable magnet was used for off-axis deflection of the electron trajectories in the microscope column such that parts of the trajectories are stopped by the apertures of the electron optical elements. As a result, the contrast caused by the stray fields of the magnetic domains is significantly enhanced. The distribution of the local magnetic fields at the surface is reconstructed from the image by means of a theory on the contrast mechanism.
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