Abstract
AbstractThe preparation of single ferromagnetic layers in ultrahigh vacuum provides interesting new phenomena in magnetism. Three examples will be given: (i) Pseudomorphic growth of Ni, Co, Fe on fcc‐Cu single crystals produces ferromagnets with tetragonal and trigonal symmetry. This enlarges the magnetic anisotropy energy (hard magnets) by several orders of magnitude. (ii) In two‐dimensional ferromagnetic films the spin‐fluctuations are much more dominant than in bulk ferromagnets. As a result the magnetic ordering temperature of coupled ferromagnets can be shifted by 50–100 K. (iii) By varying the film thickness the Curie‐temperature can be shifted to any convenient value. This allows to study in a detailed manner critical phenomena, e.g. the critical exponent γ for Fe/V‐multilayers.
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