S9Co NMR Observation for Compound Formation at Interface of Co-Sb Multilayered Film

The interface magnetism of Co-Sb multilayered films with artificial superstructure has been studied from the 59Co NMR. The NMR signals from the nonmagnetic interface regions were successfully observed, distinctly separated from those from the ferromagnetic interior regions. The pattern of the spectrum suggests the possibility of the formation of a two-dimensional compound at the Co-Sb interface, where the local symmetry of Co atoms may have a similar structure as CoSb2 or CoSb3.