The effect of ultrahigh vacuum on ordering temperature, crystallographic and magnetic properties of L10 FePt (001) film grown on a CrRu underlayer were investigated. The base pressure was adjusted by initially flushing with 99.99% purity nitrogen gas in vacuum system. The residual nitrogen gas in the deposition chamber causes the increase in the ordering temperature and the formation of face-centered-cubic-phase FePt grains in the films. Furthermore, the residual gas deteriorates the FePt (001) texture. Large uniaxial anisotropy constant Ku⩾1×107erg∕cm3, and good magnetic squareness (∼1) were obtained at the temperature of Ts⩾250°C when the base pressure is 3×10−8Torr.
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Chen et al. (2004) studied this question.
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