Regensburg 2007 – scientific programme
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DS: Fachverband Dünne Schichten
DS 10: Layers with Magnetic Properties
DS 10.2: Talk
Monday, March 26, 2007, 17:30–17:45, H34
Structural and magnetic characterization of Heusler multilayers — •Miriana Vadala1, Alessio Lamperti2, Alexei Nefedov1, Gregor Nowak1, Kurt Westerholt1, Maximillian Wolff1, and Hartmut Zabel1 — 1Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, Germany — 2Departement of Physics, University of Durham, United Kingdom
Heusler alloys are attractive candidates for application in spin dependent electron transport devices such as Giant Magneto Resistance (GMR), and in magnetic high performing devices. - We have grown by rf-sputtering multilayers of Heusler phase Co2MnGe on Al2O3 and MgO substrates. We performed hard X-rays measurements to determine the chemical density profile and the epitaxial orientation inside these systems and polarized neutron reflectivity to study the magnetization profile of thin Co2MnGe/Al2O3 and Co2MnGe/MgO thin multilayers. X-ray scattering both at small and high angles showed intense Bragg peaks, respectively indicating high interface sharpness and crystallinity of the Heusler phase. Neutron maps, taken at room temperature and 10 K, both in saturated and remanence magnetization, evidenced a sharp magnetisation profile at the Heusler/Oxide interfaces with Bragg peaks detected up to the 4th order; the absence of diffuse scattering indicates that the magnetic roughness is very small.
Financial support provided through the EU RTN "ULTRASMOOTH", as well as the partial support by SFB 491 and by BMBF 03ZA6BC1 is acknowledged.