Regensburg 2007 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 10: Layers with Magnetic Properties

DS 10.2: Vortrag

Montag, 26. März 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 4^th 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.