Abstract
The magnetic domain structures of ultrathin Co films, epitaxially grown on Ni(110) substrate, were studied by a Kerr microscope combined with a digital image processing system for the first time. The digital image processing system allows us to subtract contrast of nonmagnetic origin from the magneto–optic image. It was found that the Co(110)/Ni(110) system exhibits domain structures different from that of the Ni(110) substrate. Irregular domains of ultrathin Co films larger than 2 mm were observed, while plate(stripe)-like domains were found for the Ni(110) substrate. Furthermore, the domain patterns of the Co(110)/Ni(110) system are strongly influenced by the adsorption of gas and variation of temperature.
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