Structural and magnetic properties of Fe(5 nm)/Mn(t Mn )/Fe(5 nm) (t Mn from 0.5 to 3.0 nm͒ sandwich structures, grown by molecular-beam epitaxy between 50°C and 150°C, were investigated using reflection high-energy electron diffraction ͑RHEED͒, x-ray-diffraction, Mössbauer spectroscopy, and magnetization measurements. Epitaxial bct-Mn structures only form for t Mn Ͻ1 nm, independently of the growth temperature. Room-temperature conversion electron Mössbauer spectra are composed of two magnetic components with in-plane magnetic moments. The first subspectrum has hyperfine parameters close to ␣-Fe and is therefore associated with Fe atoms far from the interface regions. The second component, fitted with a hyperfine field ͑hf͒ distribution, has an isomer-shift value similar to ␣-Fe and a maximum in the distribution curve at about 31 T. This subspectrum is related to the Fe atoms close to the Mn layer ͑interface regions͒. Low-field components in the hf distribution curves indicate the presence of Fe atoms or/and Fe clusters in the Mn spacers. An Fe-Mn alloy was observed for the samples grown for temperatures higher than or equal to 50°C and where the RHEED patterns show the presence of the ␣-Mn phase. Magnetization data show that the Fe layers are ferromagnetically coupled for all trilayers prepared at substrate temperatures lower than 150°C. A noncollinear coupling was found for the trilayer with Mn thickness of 1 nm and grown at 150°C.
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