The University of Dublin | Trinity College -- Ollscoil Átha Cliath | Coláiste na Tríonóide
Trinity's Access to Research Archive
Home :: Log In :: Submit :: Alerts ::

School of Physics >
Physics >
Physics (Scholarly Publications) >

Please use this identifier to cite or link to this item:

Title: Morphology and strain-induced defect structure of ultrathin epitaxial Fe films on Mo(110)
Sponsor: Science Foundation Ireland
Author's Homepage:
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);
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
Related links:
Appears in Collections:Physics (Scholarly Publications)

Files in This Item:

File Description SizeFormat
Morphology.pdfPublished (publisher's copy) - Peer Reviewed1.04 MBAdobe PDFView/Open

This item is protected by original copyright

Please note: There is a known bug in some browsers that causes an error when a user tries to view large pdf file within the browser window. If you receive the message "The file is damaged and could not be repaired", please try one of the solutions linked below based on the browser you are using.

Items in TARA are protected by copyright, with all rights reserved, unless otherwise indicated.


Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback