Abstract
We report on the first results of a structural and magnetic investigation of Fe 1− x Co x /Mn/Fe 1− x Co x trilayers ( x=0 –0.75). In situ low energy electron diffraction shows that Mn grows epitaxially on BCC Fe 1− x Co x ( x⩽0.75) with a good crystallinity up to 30 Å. Reflectivity and small angle diffuse scattering of synchrotron radiation reveal sharp interfaces, each of them having two lateral characteristic lengths in the height–height correlation function that differ by one order of magnitude. The long-range height–height correlation function is vertically correlated and the short-range one is not. From magneto-optical Kerr effect measurements, evidence for non-collinear coupling between Fe 1− x Co x layers ( x=0 and 0.5) was found for Mn spacer thicknesses below 12 Å. Polarized neutron reflectometry performed at 300 K reveal a net magnetization of 0.8 ± 0.3 μ B /at in the Mn layer in Fe 0.5Co 0.5/Mn/Fe 0.5Co 0.5 and no net magnetization in the Mn layer in Fe/Mn/Fe.
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