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The phase immiscibility and the excellent matching between Ag(001) andFe(001) unit cells (mismatch 0.8 %) make Fe/Ag growth attractive in the fieldof low dimensionality magnetic systems. Intermixing could be drasticallylimited at deposition temperatures as low as 140-150 K. The film structuralevolution induced by post-growth annealing presents many interesting aspectsinvolving activated atomic exchange processes and affecting magneticproperties. Previous experiments, of He and low energy ion scattering on filmsdeposited at 150 K, indicated the formation of a segregated Ag layer uponannealing at 550 K. Higher temperatures led to the embedding of Fe into the Agmatrix. In those experiments, information on sub-surface layers was attained bytechniques mainly sensitive to the topmost layer. Here, systematic PEDmeasurements, providing chemical selectivity and structural information for adepth of several layers, have been accompanied with a few XRD rod scans,yielding a better sensitivity to the buried interface and to the film longrange order. The results of this paper allow a comparison with recent modelsenlightening the dissolution paths of an ultra thin metal film into a differentmetal, when both subsurface migration of the deposit and phase separationbetween substrate and deposit are favoured. The occurrence of a surfactant-likestage, in which a single layer of Ag covers the Fe film is demonstrated forfilms of 4-6 ML heated at 500-550 K. Evidence of a stage characterized by theformation of two Ag capping layers is also reported. As the annealingtemperature was increased beyond 700 K, the surface layers closely resembledthe structure of bare Ag(001) with the residual presence of subsurface Feaggregates.Comment: 4 pages, 3 figure

physical review. b, condensed matter and materials physics

Surfactant effect and dissolution of ultrathin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow></mml:math>films on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Ag</mml:mi><mml:mo>(</mml:mo><mml:mn>001</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math>

Surfactant effect and dissolution of ultrathinFefilms onAg(001)