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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/40366

Title: Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)
Author: SHVETS, IGOR
MARIOTTO, GUIDO
MURPHY, SHANE
Sponsor: Science Foundation Ireland
Author's Homepage: http://people.tcd.ie/ivchvets
http://people.tcd.ie/mariotl
http://people.tcd.ie/shmurphy
Keywords: Atomic, molecular and chemical physics
thin films
Issue Date: 2002
Publisher: The American Physical Society
Citation: Murphy, S.; Mac Mathúna, D. M.; Mariotto, G.; Shvets, I. V., Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110), Physical Review B (Condensed Matter and Materials Physics), 66, 19, 2002, 195417
Series/Report no.: Physical Review B (Condensed Matter and Materials Physics);
66;
19;
Abstract: Fe films in a coverage range of 0.4<~θ<~4.7ML were deposited on a Mo(110) substrate in the 300<~T<~700K temperature range. It is found that growth around 300 K is mediated by the step-flow growth mechanism, in contrast with previous studies of the Fe/Mo(110) and Fe/W(110) systems, where growth at 300 K was mediated by two-dimensional island nucleation and coalescence. This difference is attributed to the slightly higher substrate temperature (between 300 and 345 K) during deposition. A transition from layer-by-layer to Stranski-Krastanov growth is observed in films grown in the 300<~T<~345K range at around a 1.8 ML coverage. Strain-relieving dislocation defects appear along the [001¯] direction in the second Fe layer and develop with increasing film thickness into a dislocation network at around a 2.4 ML coverage. The dislocation defects in the second Fe layer act as preferential nucleation sites for third layer islands. At elevated temperatures (495<~T<~700K), the first and second Fe layers are formed by the step-flow growth mechanism. Subsequent coverages are characterized by the formation of distinctive wedge-shaped islands supported on an Fe monolayer. A two-dimensional dislocation network is formed in the fourth Fe layer of these islands, from an array of closely-spaced dislocation lines in the third layer. Similar to the Fe/W(110) system, the magnetic properties of these films are expected to vary significantly on the nanometer scale and they are therefore potential candidates for spin-polarized scanning tunneling microscopy studies.
Description: PUBLISHED
URI: http://hdl.handle.net/2262/40366
Related links: http://dx.doi.org/10.1103/PhysRevB.66.195417
Appears in Collections:Physics (Scholarly Publications)

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