Regensburg 2007 – scientific programme
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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
Tuesday, March 27, 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 µB 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.