Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 80: Epitaxy and growth: Metals and semiconductors I

O 80.6: Vortrag

Donnerstag, 17. März 2011, 16:15–16:30, WIL C307

AES/LEED/I(V) LEED investigation of ultrathin Pb and In layers deposited on Ni(001) and Ni(111) faces — •Katarzyna Miśków and Aleksander Krupski — Institut of Experimental Physic, University of Wrocław, Wrocław, Poland

Properties of ultrathin indium and lead layers deposited on Ni(001) and Ni(111) faces at temperature between T = 150 K and T = 950 K and coverage up to 6 ML have been studied by AES-t, LEED and I(V) LEED. For In/Ni(111), Frank-van den Merwe and Stranski-Krastanov type of growth is observed for temperature below and above 450 K, respectively. In case of In/Ni(001), below T < 600 K it seems that Volumer-Weber or Simultanoeous Multilayers type of growth plus Simultanous Multilayers type of growth. For the adsorption of Pb on Ni(001) only Volumer-Weber type of growth is observed. Two different indium structures have been found for (001) and (111) faces of nickel. For In/Ni(001) the p(2x2) structure has been observed for temperature between 600 K and 950 K. At about 950 K, reconstruction of the p(2x2) structure to c(2x2) one takes place. In case of In/Ni(111) the p(2x2) structure has also been observed, but for temperature between 450 K and 850 K. At about 900 K reconstruction of the p(2x2) structure to the p(3x3)R30 one is observed. In case of Pb/Ni(001) only the c(2x2) structure has been observed. Indium makes surface alloy on both nickel crystal faces upon annealing while for lead, only desorption process is observed. The atomic structure and relaxation of the clean Ni(111) surface were investigated with the use of experimental I(V) LEED profiles and theoretical TensErLEED calculations.