Lorentz microscopy of magnetic granular films

Lorentz microscopy is successfully applied to observe the magnetic structur es of iron particles embedded in thin magnetic granular films. Fe-Mo and Fe -MgO films. Images of experimentally observed Fe particles, 25 and 60 nm in diameter, are compared with simulated ones. Single-magnetic-domain particl es could be observed. Cylindrical Fe particles 2-8 nm in diameter and 10-20 nm thick in an Fe-MgO film showed clear black-and-white-pair contrast in a region about 30 nm in diameter, which seems to be the range of the area ha ving magnetic correlation.