The structure of the (100) surface was studied by means of thermal-energy He-atom scattering, low-energy electron diffraction and Auger electron spectroscopy. A c(4 x 2) surface reconstruction was revealed by the low-energy electron diffraction and thermal-energy He-atom scattering measurements. This reconstruction was sometimes mixed with a (v5 x v5) reconstruction which was found to be due to a very slight O-contamination. Only double-layer steps were found at the surface. The reconstructed layer started to disorder at above 500K, but short-range ordering in this layer was still observed at up to 700K. The segregation of Co was observed at near to 900K by means of Auger electron spectroscopy. The increase in the Co concentration was consistent with filling-up of the ¼-monolayer, which was necessary for the c (4 x 2) reconstruction, to give a complete monolayer at 900K. This implied that the surface was always terminated by Co atoms.

Reconstruction of the CoGa(100) Surface Studied by Thermal-Energy Helium-Atom Scattering, LEED and AES. F.M.Pan, C.Pflitsch, R.David, L.K.Verheij, R.Franchy: Physical Review B, 2001, 63[12], 125414 (7pp)