Epitaxy of Co on FeAl[l brace]001[r brace]. I. 1[times]1 films

Journal Article · Wed Jun 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.17385· OSTI ID:7236610

Wang, C P ^[1]; Wu, S C ^[2]; Jona, F; Marcus, P M ^[1]

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1. Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275 (United States)
2. Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275 (United States) Physics Department, Peking University, Beijing 100871 (China)

Ultrathin films of Co have been grown by slow vapor deposition on an FeAl[l brace]001[r brace] substrate (lattice constant [ital a][sub 0]=2.904 A). Up to a thickness of about 13 A the films are found to be pseudomorphic with the substrate, but contain 5--10 at. % Al. Quantitative low-energy electron diffraction (LEED) finds the best-fit model for the films to be pure Co with body-centered-tetragonal structure, bulk interlayer spacing 1.40[plus minus]0.03 A, and first interlayer spacing 1.25[plus minus]0.03 A, suggesting that the Al impurities were disordered and contributed only to the background of the LEED pattern. Strain analysis gives ambiguous results with regard to the equilibrium phase, as both fcc and bcc Co (metastable phases) have strain ratios within acceptable limits. The strains themselves are unusually large for fcc Co and fairly small for bcc Co, but the Poisson ratio has normal values for fcc Co and unusually small values for bcc Co. The contraction of the first interlayer spacing is abnormally large ([similar to]11%) for magnetic materials.

• DOE Contract Number: FG02-86ER45239
• OSTI ID: 7236610
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:24; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
COATINGS
COBALT
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELEMENTS
EPITAXY
IRON COMPOUNDS
MECHANICAL PROPERTIES
METALS
POISSON RATIO
STRAINS
SUBSTRATES
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VAPOR DEPOSITED COATINGS