Physics – Condensed Matter – Materials Science
Scientific paper
2001-07-20
Physics
Condensed Matter
Materials Science
13 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.88.147201
On the basis of a first-principles electronic structure theory of finite temperature metallic magnetism in layered materials, we investigate the onset of magnetic order in thin (2-8 layers) fcc-Fe films on Cu(100) substrates. The nature of this ordering is altered when the systems are capped with copper. Indeed we find an oscillatory dependence of the Curie temperatures as a function of Cu-cap thickness, in excellent agreement with experimental data. The thermally induced spin-fluctuations are treated within a mean-field disordered local moment (DLM) picture and give rise to layer-dependent `local exchange splittings' in the electronic structure even in the paramagnetic phase. These features determine the magnetic intra- and interlayer interactions which are strongly influenced by the presence and extent of the Cu cap.
Györffy Balazs L.
Razee S. S. A.
Staunton Julie B.
Szunyogh László
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