Observation of surface composition of copper-nickel alloy by auger spectra in the lower energy region (at around 100 eV)

The interaction of oxygen with a clean (110) molybdenum surface has been studied by LEED and RHEED. At room temperature two simple chemisorbed structures are found, at higher exposures a multiple order pattern is seen. At temperatures above 750 K a complex LEED pattern is observed. Initially a corresponding RHEED pattern is seen which has a different structure. Epitaxial oxide nucleation may be followed by RHEED but the initial process is not seen by LEED. More extensive epitaxial films are needed before oxide reflexions appear in the LEED pattern. The formation of an epitaxial oxide film is accompanied by the growth of {100} molybdenum facets. These may be seen after the film has been carefully evaporated away. The nuclei of oxide which form are shown by both RHEED and transmission microscopy of replicas to be characteristically shaped.     

A note on FMR lineshape of conductive spheres

A shoulder-shaped anomaly on the high-field side of the main FMR maximum has been re-examined in connection with a recent publication on FMR in ferromagnetic semiconductors. The positions of the shoulder are measured at 9.3 and 14.8 GHz for different values of resistivities, magnetization and sphere sizes. Results clarify the role of the surface and volume type excitations in the occurrence of the shoulder.