Abstract
The unidirectional anisotropy of exchange-coupled Ni81Fe19/Co90Fe10/Cr45.5Mn45.5Pt9 films was found to amount to ∼0.345 erg/cm2 when they were subjected to the following process: (a) an NiO-capped layer was sputter-deposited onto the CrMnPt film, (b) subsequently the films were annealed at 230°C for 3 h, and (c) finally the NiO-capped layer was eliminated by Ar ion-milling. The above anisotropy value was comparable with that of ferromagnet/Pt50Mn50 films. Furthermore, the strong unidirectional anisotropy is thought to be caused by the facts that large stress relief of the NiO-capped layer through thermal annealing acts to enlarge the c/a ratio within CrMnPt (a and c are lattice parameters), inducing a so-called stress-induced anisotropy within CrMnPt.
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