Abstract
The critical concentration required for the appearance of magnetic moments on nickel atoms deposited on a palladium substrate and covered with a thin palladium overlayer is calculated in the Ginzburg-Landau model. The effect of the palladium surface is characterised in this model by a surface extrapolation length lambda . The extrapolation length lambda is determined by comparing the calculated and observed critical concentrations for a Pd-Ni-Pd sandwich with 1% of Ni atoms covered by a palladium overlayer of four atomic layers. The negative value of lambda obtained by this method implies that the exchange enhancement of the palladium surface is stronger than in the bulk.
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