Abstract
Epitaxial Sm thin films and Sm/Y superlattices have been grown with a high single-crystal quality. The complex nine hexagonal close-packed planes stacking sequence has been successfully obtained in a 5000 \AA{}-thick film, whose magnetic behavior presents a long-range antiferromagnetic order of the hexagonal sites below 100 K, as in the bulk element. However, from neutron scattering, the relative magnetic and nuclear contributions indicate a significant enhancement of the magnetic moment compared to the bulk value. For the superlattice, the neutron-scattering results show neither long-range structural coherence of the stacking sequence along the c direction nor a coherent magnetic ordering at low temperatures.
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