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MA: Magnetismus

MA 8: Surface Magnetism

MA 8.4: Vortrag

Montag, 27. März 2006, 15:45–16:00, HSZ 103

Magnetization and neutron reflectivity of AuFe films — •V. N. Gladilin^1,2, V. M. Fomin^1,2,3, J. T. Devreese^1,3, K. Temst⁴, and C. Van Haesendonck⁴ — ¹TFVS, Departement Fysica, Universiteit Antwerpen, B-2610 Antwerpen, Belgium — ²Department of Theoretical Physics, State University of Moldova, MD-2009 Kishinev, Moldova — ³Department of Semiconductor Physics, TU Eindhoven, NL-5600 MB Eindhoven, The Netherlands — ⁴Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium

We examine the effect of surface-induced anisotropy on the impurity-spin magnetization in spherical grains of dilute AuFe alloys. The strength of the surface-induced anisotropy is analysed as a function of the ratio between the elastic mean free path for conduction electrons and the radius of a grain. Based on our results for the impurity-spin magnetization, we calculate polarised-neutron reflectivity of AuFe films, which consist of closely packed spherical grains. We show that microstructure of a film has a crucial effect on the temperature-dependent spin asymmetry in the polarised-neutron reflectivity. This work has been supported by the Concerted Action (GOA) and the Interuniversity Attraction Poles (IAP) research programmes, and also by the Fund for Scientific Research – Flanders (FWO projects G.0306.00, G.0274.01, G.0435.03, and WOG WO.035.04N).