The adsorption of Ni on W (110) and (211) surfaces

Structure and perpendicular magnetization of Fe/Ni(111) bilayers on W(110)

“…We tentatively assign this to the special morphology of this 1 ML Fe/1 ML Ni bilayer. It is well known from earlier experiments 6 that Ni undergoes a series of different atomic arrangements on the W͑110͒ substrate, starting from a 1ϫ1 structure at low coverage, showing a 8ϫ1 coincidence structure for increasing coverage before a 7ϫ1 structure indicates the completion of the first monolayer. This first Ni layer is not yet sufficiently fcc-like to allow the growth of smooth fcc Fe, whereas a 2 ML Ni template is.…”

Core-level spectroscopy of the Ni/W(110) interface: Correlation of W interfacial core-level shifts with first-layer Ni phases

“…Initially, the first overlayer grows in 1×1 pseudomorphic (ps) islands [1,7]. Although the ps phase is believed to be thermodynamically stable up to a full ML [7,14], limited diffusion at RT induces a transition to the 8×1 commensurate phase at a lower coverage.…”

“…Although the ps phase is believed to be thermodynamically stable up to a full ML [7,14], limited diffusion at RT induces a transition to the 8×1 commensurate phase at a lower coverage. Depending upon the amount of residual gas contamination and/or the density of steps [7], this transition begins somewhere between ∼0.25 and ∼0.9 ps ML [1,10,[18][19][20]40]. The density of the 8×1 phase is not universally agreed upon [20]: some researchers favor a density of 1.59 × 10 15 atoms cm 2 (which occurs if there are 9 Ni-atom spacings per 8 W-atom spacings along the [001] direction) [18,19], while others favor a more closely packed density of 1.77 × 10 15 atoms cm 2 , (which occurs if there are 10 Ni-atom spacings per 8 W-atom spacings) [1].…”

“…In particular, the interface formed by ultrathin Ni layers grown on W(110) has been extensively studied as a model bimetallic system , in part because it is an excellent system for relating electronic structure to morphology. Using various surface analysis techniques, including low energy electron diffraction (LEED), Auger electron spectroscopy (AES), thermal desorption spectroscopy (TDS), work-function measurements, reflection high energy electron diffraction (RHEED), and/or highenergy ion scattering (HEIS), a number of early studies investigated the structure and morphology of the Ni layers as a function of Ni coverage [1][2][3][4][5][6][7]. Other early investigations probed the electronic structure of the Ni/W(110) interface using valence-band angle-resolved photoelectron spectroscopy (ARPES) and core-level x-ray photoelectron spectroscopy (XPS) [8][9][10][11][12].…”

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

“…The strain is released when a transition occurs from pseudomorpic growth to a bulk-like film. This has been intensively studied using k-space methods, e. g., low energy electron diffraction (LEED) 6 and angle resolved photoelectron spectroscopy (ARPES) 7 . Even within the same layer different crystallographic orientations may coexist.…”