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PhysRevB.94.075419.pdf (2.15 MB)

Growth, morphology, and structure of a monolayer thick GdFe2 surface alloy

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posted on 2018-05-01, 08:49 authored by R. P. Williams, S. G. Alcock, Paul B. Howes, C. L. Nicklin
The growth and structure of an ordered GdFe2 surface alloy deposited on Mo(110) has been studied using in situ surface x-ray diffraction. Growth curves and reflectivity scans of varying ratios of Gd to Fe show how the two species intermix prior to alloy formation. After annealing to form the ordered surface alloy, in-plane x-ray diffraction data indicate that the Fe atoms are laterally displaced along the [001] or [00¯1] direction by 0.16±0.02 Å from the long bridge site positions. Out-of-plane crystal truncation rod analysis reveals that the Gd atoms lie 3.40±0.09 Å above the Mo(110) bridge site, an expansion of 22% relative to the expected hard sphere distance. This is significantly larger than observed in previous studies of the growth of pure Gd on Mo(110). Simple geometric changes are not able to account fully for this expansion and we propose that hydrogen incorporation during alloy formation may also contribute.

History

Citation

Physical Review B, 2016, 94, 075419

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Physical Review B

Publisher

American Physical Society

issn

2469-9950

eissn

2469-9969

Copyright date

2016

Available date

2018-05-01

Publisher version

https://journals.aps.org/prb/abstract/10.1103/PhysRevB.94.075419

Language

en