Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.20: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

2-Dimensional-Magnetism of Fe-Monolayers in Pd — •Daniel Schumacher, Ulrich Rücker, and Thomas Brückel — IFF-Streumethoden, Forschungszentrum Jülich, 52425 Jülich

Pd almost fulfils the Stoner-criterion to be ferromagnetic. The aim of the work reported here is to explore in detail, how an ultrathin ferromagnetic layer inside a Pd thin film polarizes the surrounding Pd layer. As a function of the thickness of the Fe layer, we investigate the transition from 3d to 2d behaviour inside a Pd matrix.

Samples have been grown by molecular beam epitaxy (MBE) on GaAs substrates using an Ag buffer layer. The epitaxial growth and the surface qualities have been characterized by in-situ LEED and AUGER analysis to optimize the parameters of the preparation process. In addition, the surface quality has been analysed by X-ray-reflectometry. After that some wedge patterned Fe layers in Pd were produced. Thus different layer thicknesses have been obtained all grown at constant parameters (e.g. temperature, pressure, growth rate). The first step to explore the magnetic properties of these samples was done by MOKE measurements.

Polarized neutron scattering under grazing incidence is the method of choice to investigate the magnetization density profile as well as lateral magnetic correlations. By using neutron reflectometry magnetic correlations can be determined as a function of applied field, external temperature and dimensionality.