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HK: Hadronen und Kerne
HK 19: Application of Nuclear Techniques I
HK 19.3: Talk
Monday, March 16, 1998, 17:30–17:45, G
Neutron reflectometry for the unambigous determination of surface profiles* — •J. Kasper1, H. Leeb1, and R. Lipperheide2 — 1Institut f"ur Kernphysik, Technische Universit"at Wien , Wiedner Hauptstraße 8–10, A-1040 Wien — 2Hahn-Meitner-Institut Berlin, Glienickerstraße 100, D-14109 Berlin
A novel neutron specular reflection method is presented which yields the full reflection coefficient (amplitude and phase) for non-magnetic and magnetic samples. It makes use of the interference effects between the reflections of a known reference layer and those of the investigated profile, which can be detected by polarisation measurements. For magnetic samples one can determine both non-spin-flip and spin-flip matrix elements and thus reconstruct internal magnetic fields. Simulations show good stability against measurement errors and the effects of surface roughness. The method is suited to provide valuable insight into the magnetic structure of multilayers and superlattices since it yields the necessary information for an unambiguous reconstruction of the scattering-length density and the magnetisation profile.
*) This work has been suported by Jubil"aumsstiftung der Oesterreichischen Nationalbank, project number 6212.