Abstract
A comprehensive study of effects of adsorbate and structural disorder on surface enhanced Curie temperature of Ni-Al solid-solutions is reported. A recently developed procedure for monitoring magnetic transitions by means of attenuations induced in the low-energy Auger electrons spectrum has been used. Sulfur segregation and argon bombardment were found to reduce the surface related Curie temperature in a similar, significant manner. Its particular dependence on coverage or ion dose is discussed in the framework of the Kirkwood correlational approximation which has been adapted for semi-infinite, spin-1/2 Ising ferromagnet with enhanced, but progressively randomized surface magnetic moments. The calculations fit the data with a single adjustable parameter reflecting the extent of S or Ar+ induced fluctuations in the Ni surface exchange coupling.
| Original language | English |
|---|---|
| Pages (from-to) | 381-385 |
| Number of pages | 5 |
| Journal | Surface Science |
| Volume | 357-358 |
| DOIs | |
| State | Published - 20 Jun 1996 |
Keywords
- Auger electron spectroscopy
- Ising models
- Magnetic surfaces
- Ni alloys
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
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