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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.108: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Implementation of Co2MnSi electrodes in magnetic tunnel junctions: magnetic and chemical bulk properties compared to the interface — •Jan Schmalhorst1, M. Sacher1, S. Kämmerer1, V. Höink1, G. Reiss1, A. Hütten1, D. Engel2, A. Ehresmann2, and E. Arenholz31University of Bielefeld, Department of Physics, Nano Device Group, P.O. Box 100131, 33501 Bielefeld, Germany — 2Department of Physics, Kaiserslautern University of Technology, D-67663 Kaiserslautern, Germany — 3Lawrence Berkeley National Laboratory, Advanced Light Source, Berkeley, CA 94720, USA

The 100% spin polarization predicted theoretically for some Heusler alloys make them attractive for spintronic applications, e.g., as electrode material in magnetic tunnel junctions. The formation of a high quality tunneling barrier without generating defects in the adjacent half-metallic electrode is the crucial preparation step. We have prepared Co2MnSi / AlOx / Co7Fe3 junctions showing a low temperture / low bias voltage tunneling magnetoresistance of 95% corresponding to an effective spin polarization of 66% instead of the predicted half-metallicity. By comparing soft X-ray absorption in total electron and total fluorescence detection we have determined differences of the chemical and the magnetic properties in bulk Co2MnSi and at the Co2MnSi / AlOx interface. These results show up a way of how to improve the magnetoresistive transport in the future. The authors gratefully acknowledge the opportunity to perform soft X-ray absorption spectroscopy at the Advanced Light Source, Berkeley, USA and at the Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung m.b.H., Berlin, Germany.

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