Abstract
L10 FePt film exhibits a very large magnetocrystalline anisotropy (7×107 ergs/cc). It therefore becomes a promising material candidate for ultrahigh areal density heat assisted magnetic recording media. This paper discusses the effect of pressure on the microstructure and magnetic properties of L10 FePt:X thin films. It has been found that Ar pressure plays an important role in controlling the properties of the composite polycrystalline thin films. As the pressure increases, FePt:X films show much better segregation in the microstructure of the amorphous materials within the grain boundary, and the FePt grain size decreases accordingly. It was also found that media coercivity increases as the film microstructure changes from a maze type to a granular type, along with the pressure increase. This is likely due to the enhanced exchange decoupling of the FePt grains in the magnetic layer. The microstructure’s evolution with pressure is in agreement with a structural zone model of the composite polycrystalline thin films.
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