- Title
- Geometric contrast mechanisms in helium atom scattering: the growth of the Fe/Cu(100) system
- Creator
- Dastoor, P. C.; Allison, W.
- Relation
- Physical Review B: Condensed Matter and Materials Physics Vol. 67
- Publisher Link
- http://dx.doi.org/10.1103/PhysRevB.67.245403
- Publisher
- American Physical Society
- Resource Type
- journal article
- Date
- 2003
- Description
- The extremely short de Broglie wavelengths of thermal helium atomic beams make them ideally suited as sensitive probes of surface structures. Recent developments in the methods used to analyze helium atom scattering data make it possible to measure interlayer spacings on metal surfaces with high precision. We present results of the application of this technique to the growth of a heavily reconstructed system. Helium atom scattering has been used to study the variation of interlayer spacing during the growth of ultrathin iron films on copper(100). Using the parameter-independent analysis technique, the interlayer spacings of iron films up to five-monolayers thick have been directly measured. The results show that it is possible to identify three distinct regions from 0 to 5 ML of Fe coverage. In the regime from 0 to 2 ML of Fe there is a large initial expansion of the out-of-plane lattice parameter of the iron film. In the regime from 2 to 4 ML of Fe, the interlayer spacing contracts to a value that is slightly expanded relative to the bulk spacing expected for fcc Fe. Above 4 ML of Fe the interlayer spacing approaches that expected for bulk fcc Fe. The results are discussed in the context of the latest models for the growth of Fe/Cu(100).
- Subject
- de Broglie wavelengths; helium atom scattering; iron films; copper(100)
- Identifier
- http://hdl.handle.net/1959.13/33865
- Identifier
- uon:3333
- Identifier
- ISSN:1098-0121
- Language
- eng
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