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Magnetic properties and microstructure in (Fe,Co)/Pt multilayer films

Multilayer films such as (Co/Pt) are considered to be potential candidates for future high density optical recording media, since they exhibit a strong magneto-optic Kerr activity at wavelengths less than about 500 nm. The magnetic properties of those multilayer films, however, are very sensitive to the way the films are grown, and thus it is the key for achieving better performance to understand how they are correlated to the microstructure. Very little understanding has ever been achieved as to the correlation between the microstructure and the magnetic properties. This is particularly so for the coercivity, which is the important factor governing the domain shape and its size. In view of this aspect, we have systematically examined how the fabrication condition affects the microstructure of both Co/Pt and Fe/Pt multilayer films and in turn influences the magnetic properties.