Effect of FePt-C nucleation layer on magnetic properties and nanostructure for FePt-C / FePt-oxide stacked media

Magnetic properties and nanostructure for FePt-30vol%C (2 nm) / FePt-30vol% GBM (0–8 nm) stacked media was investigated. Following effects of the employment of FePt-C nucleation layer (NL) were confirmed: 1) Msavevaries linearly against melting point (T m) with value (500–600 emu/cm
³
) smaller than that of media without NL (500–750 emu/cm
³
) due to volume average of Msave for FePt-C and FePt-GBM granular layer, 2) There is no strong correlation between grain diameter (GD) and degree of ordering (Sinfilm) of the stacked media with T m of the GBM, 3) Ku┴ film dependence on Sin
^film
for media with NL shows similar behavior with that of without NL, 4) for media with the same total thickness, the smaller I
110
inplane for media with NL than that of without NL reveals that disorder portion in the media with NL increases, 5) the improvement of linearity in I
110
inplane for media with NL against total thickness suggests that the homogeneity of the media with is improved, 6) reduction of I
100
linplane from XRD in-plane profile, reflected in ℓ4θ
^sat
from the torque curve which suggests the reduction of the ratio of FePt grains with their c-axes parallel to the film plane. Further effort would be required to completely exclude the in-plane component.