The magnetic anisotropy of epitaxial [Co_24/Mn(tMn)]₁₂ superlattices is studied as a function of the Mn layer thickness by means of ferromagnetic resonance. For fixed cobalt layer thickness one finds a transition from a (111) fcc to a (0001) hcp cobalt structure at a critical thickness of 10--12 {} for the Mn layers. This is seen from the sharp increase of the uniaxial magnetocrystalline anisotropy from nearly zero to 2×{}10⁶ erg/cm³. A similar enhancement of the perpendicular to in-plane resonance linewidth by a factor of 4 indicates a strong increase of the number of structural defects. The complete out-of-plane angular dependence of the resonance field yields the second- and fourth-order uniaxial magnetic anisotropy constants whereas that of the ferromagnetic resonance linewidth gives a measure of the magnetic homogeneity. The experimental results are well explained by a theoretical model which allows us to estimate the number of defects within the Co layers and to discuss their origin. {} 1996 The American Physical Society.
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Farle et al. (1996) studied this question.
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