Angle resolved ultraviolet photoelectron spectroscopy study of ultrathin iron films on Si(111) surfaces

Abstract

Ultrathin iron films deposited on Si(111) 7×7 surfaces were investigated by low-energy electron diffraction–Auger electron spectroscopy (LEED–AES) and angle resolved ultraviolet photoelectron spectroscopy (ARUPS). On Si(111)7×7 surfaces, iron film grew layer by layer and formed an Fe(111) epitaxial film. At about the stage of monoatomic layer, the LEED pattern changed from 1×1 to 2×2 superstructure owing to annealing above 400 °C. At the same time a shift of Fe d-band peak to the higher binding energy side by 1.2 eV was observed by means of ARUPS measurements. It was also found that the peak intensity peculiar to 2×2 structure was sensitive to the angle of incident light as well as to the direction of emission.