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DS: Fachverband Dünne Schichten

DS 2: Thin Film Characterisation: Structure Analyse and Composition (XRD, TEM, XPS, SIMS, RBS, ...) II

DS 2.3: Talk

Monday, March 23, 2009, 14:30–14:45, GER 37

Studies of interdiffusion and magnetism in magnetic multilayers — •Mathias Schmidt, János Major, Adrian Rühm, Márton Major, Max Nülle, and Helmut Dosch — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart

Strongly reflecting so-called supermirrors are frequently used in neutron optics in many ways, for example in neutron guides or as magnetic polarizing mirrors. They consist of aperiodic multilayers of two materials with a layer thickness in the nanometer range. The properties of such multilayers are strongly dependent on the quality of the interfaces (geometrical and magnetic roughness, intermixing). Irregularities usually are introduced in the production phase. To improve the understanding of the technological processes, we investigated the interdiffusion of the components in periodic Ni-Ti and Fe-Si multilayers. The samples were annealed at different temperatures from 100^∘C to 300^∘C and neutron and x-ray reflectivity and neutron off-specular scattering experiments have been performed. In the case of the Fe-Si samples, the neutron experiments were performed also in spin-resolved mode. The results of the experiments, their detailed analysis and the obtained annealing-dependent interface roughnesses (chemical and magnetic), as well as the interdiffusion properties of the samples will be presented.