Abstract
We discuss the application of a beam of spin-polarized neutrons at grazing incidence to study ferromagnetism in ultrathin films of Fe(001) and Co(001) epitaxially grown in the metastable f.c.c. phase. Orders of magnitude increase in signal sensitivity are obtained by covering the magnetic layer with an epitaxial coating of Cu(001), thereby creating neutron interference enhancement in the thin-film sandwich structure. The ferromagnetism in cobalt films down to a single monolayer thickness can be measured with this technique.
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