Berlin 2005 – wissenschaftliches Programm
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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
Montag, 7. März 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.