Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.15: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Characterization of Co doped ZnO films on r-plane sapphire — •Milan Gacic, Gerhard Jakob, and Hermann Adrian — Institut für Physik, Universität Mainz, Staudinger Weg 7, 55128 Mainz

Diluted magnetic semiconductors (DMS) have recently attracted much interest because of there potential application in spintronics. Thereby ferromagnetism above room temperature is essential for practical applications, as found in Co doped ZnO. Though it is still very controversial if ferromagnetism in (Zn,Co)O is intrinsic and if yes by what kind of mechanism the exchange between the magnetic ions is mediated.

We report our results concerning growth and characterization of 5% Co doped ZnO films fabricated by pulsed laser deposition on r-plane sapphire. Our samples showed ferromagnetic and paramagnetic behaviour with weak in-plane anisotropy with ferromagnetism strongly depending on preparation conditions. Therefore we analysed the magnetic properties as a function of preparation parameters like laser energy, temperature an ambient pressure. The samples were characterized using x-ray diffraction, SQUID and VSM magnetometry.