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 20.106: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Heterostructures based on ZnO and Magnetic Materials – a Possible Way to Artificial Magnetic Semiconductors? — •Karl-Wilhelm Nielsen1, Maike Lübbe1, Andreas Erb1, Jürgen Simon2, Werner Mader2, Matthias Opel1, Lambert Alff1, and Rudolf Gross1 — 1Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner Straße 8, 85748 Garching — 2Institut für Anorganische Chemie, Rheinische Friedrich-Wilhelm Universität, Römerstraße 164, 53117 Bonn
Diluted Magnetic Semiconductors (DMS) are interesting materials for spintronics due to the combination of semiconducting and magnetic properties. A promising candidate in this field is transition metal doped ZnO, since this material systems allows for ferromagnetism at room temperature. Very recently, the observed room temperature ferromagnetism in ZnO-based DMS was explained by Venkatesan et al. [1] in term of a model based on a narrow impurity band.
Whereas in usual DMS the magnetic ions are distributed statistically within the semiconducting matrix, in our work we want to artificially synthesize a new class of DMS by growing epitaxial heterostructures consisting of semiconducting and magnetic materials. We present our first steps in this direction based on heterostructures consisting of ZnO and magnetic materials. The samples are prepared by UHV pulsed laser deposition and are characterized by SQUID-magnetometry, transport measurements and transmission electron microscopy.
This work is supported by the DFG via SPP 1157.
[1] M. Venkatesan et al. Phys. Rev. Lett. 93 177206 (2004).