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    Exchange coupling in nano-metric Fe/Co multilayers

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    Fe/Co multilayers were e-beam evaporated in uhv. Iron thickness was comparable to the domain wall width of bulk iron, and three times that of cobalt. A single-phase magnetic behavior was observed with saturation magnetization comparable to that of iron and coercive force just below that of cobalt film. The squareness of hysteresis loop indicates high homogeneity and low defectivity

    Weak stripe domains in Co/Fe multilayers

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    Ultra-high-vacuum electron-beam-evaporated Co/Fe multilayers (C-x/Fe-3x with x = 5, 10, 15 nm) were studied by atomic and magnetic force microscopy (AFM, MFM), vibrating sample magnetometry (VSM) and conversion electron Mossbauer spectroscopy (CEMS). MFM investigation showed long, dense and parallel domain regions (stripe domains) with the average width decreasing with the multilayer thickness. VSM and CEMS measurements showed the presence of an out-of-plane anisotropy, whose origin is ascribed to a planar stress at the interfaces, and which can give account of the observed narrow stripe domain pattern

    Temperature dependence of in-plane magnetic anisotropy of Co/Fe multilayers

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    Co/Fe multilayers with constant Co layer thickness (tCo=5 nm) and Fe layer thickness (tFe) in the range 5–10 nm were electron beam evaporated in ultra-high vacuum. For tFe <10 nm the films showed an in-plane uniaxial magnetic anisotropy. For tFe=10 nm the uniaxial anisotropy lowered and stripe domains formed. The role of temperature and Fe layer thickness was investigated. The observed phenomena can be ascribed to surface anisotropy
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