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We have prepared ferromagnetic (Fe) and superconducting (Nb) multilayered films, whose structural properties depend on the choice of substrate. The magnetic properties were investigated by use of magnetization and hyperfine field measurements. The multilayered films with Fe layers thinner than 3.0 do not exhibit spontaneous ferromagnetic ordering. Their superconducting behavior changes from two dimensional to three dimensional as the Fe-layer thickness decreases. The critical thicknesses at which the superconductive dimensionality changes and at which the ferromagnetism disappears do not coincide. Some samples with monatomic Fe layers showed an anomalous anisotropy in the upper critical field (Hc2).
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Kawaguchi et al. (1992) studied this question.
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