Exchange coupling of bcc-Fe
55Co
30Ni
15/bcc-like-Cr
45-Mn
45Pt
10 films and lattice distortion of their CrMnPt films were investigated. In this system, the unidirectional anisotropy constant (
Ke) continued to increase even if the CrMnPt thickness (
tCrMnPt) was more than the critical thickness, because the lattice distortion of the CrMnPt film was amplified by increasing
tCrMnPt. The reason for this was that the total stress applied to the lattice of the CrMnPt film through annealing, due to a positive spontaneous lattice distortion of the CrMnPt film and a negative FeCoNi/CrMnPt lattice mismatch, increased with the depth in the CrMnPt layer from the interface. The
Ke did not saturate at the critical thickness because of the negative FeCoNi/CrMnPt lattice mismatch.
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