Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.44: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Magnetotransport Properties of Cobalt-doped ZnO — •Konrad Senn, Karl-Wilhelm Nielsen, Sebastian T. B. Goennenwein, Matthias Opel, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching

Cobalt-doped ZnO, which is predicted to be a diluted magnetic semiconductor (DMS) with a Curie-temperature well above room temperature, is a promising candidate for application in spintronics. We have grown (0001)-oriented Zn_0.95Co_0.05O-films on (0001) Al₂O₃ and (0001) ScAlMgO₄ substrates by pulsed laser deposition. The growth was monitored by high pressure RHEED. The structural quality of the films was characterized by x-ray diffraction and the magnetic properties have been analyzed by SQUID magnetometry, it revealed room temperature ferromagnetism with magnetic moments up to 0.7 µ_B/Co. To study the relation between magnetism and electrical transport, we measured their magnetotransport properties in applied magnetic fields up to 14 T in the temperature range between 3 K and 300 K. We observed an anomalous Hall effect in samples grown on both Al₂O₃ and ScAlMgO₄. We discuss our results in terms of an intrinsic ferromagnetic exchange coupling and the possible presence of cobalt precipitates.

This work is supported by the DFG via SPP 1157.