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 15.106: Poster

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

Transport properties of ion-implanted ferromagnetic SnO₂:Co from van-der-Pauw measurements — •Ali Awada¹, Dirk Menzel¹, Joachim Schoenes¹, Frank Ludwig², and Meinhard Schilling² — ¹Institut für Physik der Kondensierten Materie, TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany — ²Institut für Elektrische Messtechnik und Grundlagen der Elektrotechnik, TU Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, Germany

In the field of diluted magnetic semiconductors, transition metal doped oxides have attracted much interest because of a Curie temperture which, in contrast to GaAs:TM, is beyond 300 K. In this work, magnetron-sputtered SnO₂ thin films on fused silica substrates were doped with Co using the ion implantation technique. Thereby, the risk of Co clustering in the host material is minimized. The implanted films order ferromagnetically at room-temperature exhibiting a saturation moment of 1.2 µ_B per Co at 300 K. Since it is still under discussion whether the magnetic exchange is mediated via free electrons or by a polaron-assisted mechanism, the conductivity of the pure and implanted SnO₂ films is determined by transport measurements in van-der-Pauw geometry. Results from Hall-effect investigations yield the polarity and the concentration of the carriers. The transport data are discussed in the view of the magnetic properties.