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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 20.43: Poster

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

Magnetotransport in Sr2CrWO6 thin films — •Petra Majewski, Andrea Boger, Stephan Geprägs, Robert Geißler, Andreas Erb, Matthias Opel, Lambert Alff, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meißner-Str. 8, 85748 Garching

High Curie temperatures TC and large magnetoresistive effects in polycrystalline double perovskite samples raised renewed interest in these materials, due to possible applications in magnetoelectronics. Here we report on the structural, magnetic, and electrical properties of thin epitaxial Sr2CrWO6 films. The samples were grown in an UHV pulsed laser deposition (PLD) system. In-situ RHEED and AFM were used to monitor the growth process and surface quality. The epitaxial thin films show no parasitic phases in HRXRD measurements. Rocking curves of the (004)-film peaks have a FWHM as narrow as 0.016. From SQUID magnetometry measurements between 4 and 380 K, TC is estimated to be well above 380 K. Since the surface of the SrTiO3 substrate becomes conducting under the deposition conditions of Sr2CrWO6, an insulating heteroepitaxial NdGaO3 buffer layer was introduced in order to obtain reliable electrical transport data. The magnetotransport properties and the Hall effect have been measured in a wide temperature range (5 to 300 K) and in magnetic fields up to 15 T. The resistivity vs. temperature curves could be well described by a variable range hopping transport mechanism. In addition, grain-boundary junctions have been prepared to investigate spin-dependent tunneling effects.
This work is supported by the BMBF via grant no. 13N8279.

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