Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.72: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Dipolar induced anisotropy and self ordering in patterned films — •Katharina Theis-Bröhl1, Boris Toperverg2, Jeff McCord3, Karsten Rott4, Hubert Brückl4, and Hartmut Zabel1 — 1Department of Experimental and Solid State Physics, Ruhr-University Bochum, 44780 Bochum, Germany — 2Petersburg Nuclear Physics Institute, 188300 Gatchina, St. Petersburg, Russia — 3Material Research Institute, Helmholtzstr. 20, 01169 Dresden, Germany — 4Department of Physics, University Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany
A periodic magnetic stripe array has been studied with a combination of real and reciprocal space methods: Kerr microscopy and polarized neutron reflectivity. The basic features of our data are well reproduced by a theoretical model using DBWA and providing a set of parameters quantifying the magnetization arrangement in the stripe array system. While the specular neutron reflectivity measures a mean value of the optical potential averaged over a number of structural elements within the neutron coherence length, Bragg diffraction filters out magnetic correlation effects in the system of individual magnetic units within this length scale. Off-specular diffuse scattering probes correlations of magnetization fluctuations on a scale smaller than the coherence length. This all together gives access to a detailed understanding of the magnetization arrangement which appears to be quite complex and hardly accessible by other methods. We acknowledge funding by DFG, SFB 491 and BMBF 032AE8BO.