Morphology of Ni ultrathin films on Mo (110) and W (100) studied by LEED and STM
Citation:
Murphy, S.; Usov, V.; Shvets, I. V., Morphology of Ni ultrathin films on Mo (110) and W (100) studied by LEED and STM, Surface Science, 601, 23, 2007, 5576 - 5584Download Item:
Abstract:
The morphology of ultrathin Ni lms on Mo(110) and W(100) has been studied by low-energy electron di raction and scanning tunneling microscopy. Ni lms grow pseudomorphically on Mo(110) at 300 K for a coverage of 0.15 ML. A (8 1) structure is found at 0.4 ML, which develops into a (7 1) structure by 0.8 ML as the lm
undergoes a structural change to fcc Ni(111) at 6 ML. The growth mode switches from layer-by-layer to Stranski-Krastanov between 4 ML and 6 ML. Annealing at
around 850 K results in alloying of submonolayer lms with the substrate, while for higher coverages the Ni agglomerates into nanowedge islands. Ni lms grow
pseudomorphically on W(100) up to a coverage of around 2 ML at 300 K, above which there is a structural change from bcc to hcp Ni with the epitaxial relationship (11 2 0)Ni jj (100)W. This is accompanied by the formation of orthogonal domains of uniaxial strain-relieving dislocations from the third layer of the lm. For coverages up to 1 ML the growth proceeds by formation of two-dimensional islands, but shifts to three-dimensional growth by 2 ML with rectangular islands aligned along the h011i substrate directions. Annealing at around 550 K results in agglomeration of Ni into larger islands and increasing lm roughness.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
Author's Homepage:
http://people.tcd.ie/ivchvetsDescription:
PUBLISHED
Author: SHVETS, IGOR
Sponsor:
Science Foundation Ireland (SFI)Type of material:
Journal ArticleCollections
Series/Report no:
Surface Science601
23
Availability:
Full text availableKeywords:
In-plane magnetic anisotropy, Fe films, adsorption, surface, W (110), monoloayersMetadata
Show full item recordLicences: