The angle-resolved photoemission study for ultrathin NiO and CoO thin films on Ag(100) surfaces

A revisit to ultrathin NiO(001) film: LEED and valence band photoemission studies

“…Cheng et al [15] concluded from their photoemission studies that RT growth of ultrathin NiO film on Ag(0 0 1) consists of less unreacted metallic nickel and hence is better than high temperature growth. Our LEED studies, however, shows that the oxygen pressure during growth is an important parameter to have control over the Ni to O stoichiometry.…”

“…Yang et al [14] has performed photoemission studies on ultrathin NiO films deposited on Ag(0 0 1) at 450 K and observed appearance of these states at E F by probing the sample at different photon energies. Cheng et al [15] has deposited 1.2 ML NiO films both at RT and 453 K. Their photoemission results show existence of these states at Fermi level for the high temperature deposited films, while the RT grown films do not posses these states. They concluded that there must be segregation of metallic nickel at the subsurface region of Ag substrate which contributes to these states at Fermi level.…”

“…The growth, physical structure and antiferromagnetic structure of NiO films have attracted many research works on these systems till now. However, few recent studies are there focusing on the electronic structure of NiO film and its thickness dependence [14][15][16]. Most of the photoemission studies so far on NiO, are dedicated to bulk single crystals, where the effect of p or n type doping, vacancy defects and hydrogen reduction on the valence and conduction band have been discussed [17][18][19][20][21][22][23][24][25].…”

“…Most of the photoemission studies so far on NiO, are dedicated to bulk single crystals, where the effect of p or n type doping, vacancy defects and hydrogen reduction on the valence and conduction band have been discussed [17][18][19][20][21][22][23][24][25]. Reports are there regarding the adsorption of adatoms or foreign molecules on the crystal surface and their effect on surface electronic structure [26][27][28] as well as the vicinity effect of supporting noble metal remains unexplored [14,15], which prompts further studies on NiO ultrathin films.…”

Two-photon photoemission from CoO layers on Ir(1 0 0)

“…A recent study of the electronic structure of the CoO(1 0 0) surface reports no surface state in the fundamental band gap [13]. Photoemission studies of the occupied states focused on CoO in the rock-salt structure with (1 0 0) surface orientation [14][15][16][17][18][19]. Information on the unoccupied electronic states is available from bremsstrahlung isochromat spectroscopy (inverse photoemission) and x-ray absorption [20].…”