| Issue |
Europhys. Lett.
Volume 56, Number 5, December 2001
|
|
|---|---|---|
| Page(s) | 722 - 728 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00580-y | |
| Published online | 01 December 2003 | |
Electronic-structure modifications induced by surface segregation
in 
thin films
1
Department of Physics and Astronomy and the
Center for Material Research and Analysis, Behlen Laboratory,
University of Nebraska Lincoln, NE 68588-0111, USA
2
Material Physics Branch, Naval Research
Laboratory - Washington DC 20375, USA
Corresponding author: pdowben@unl.edu
Received:
11
July
2001
Accepted:
20
September
2001
Using spin-polarized inverse photoemission and X-ray absorption
spectroscopy techniques, we show that the electronic structure of
thin films depends on the composition at the
surface. With a gentle annealing procedure, the surface provides a
maximum of 80% spin asymmetry at 0.5
above the Fermi level
in spite of extensive 
segregation. A heavily annealed
(restructured) surface exhibits a reduced surface "ordering"
temperature of 240
(compared to the approximately 335
bulk value) as well as a reduced spin asymmetry value of 40% at
0.5 above Fermi energy.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 68.35.Fx – Diffusion; interface formation / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.)
© EDP Sciences, 2001
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