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 20.118: Poster

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

Ferromagnetism in transparent Fe- and Co-doped SnO₂ thin films — •U. Pelzer, D. Menzel, and J. Schoenes — Institut für Physik der Kondensierten Materie, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig

Diluted magnetic semiconductors have attracted great interest in recent years due to the possibility of inducing room temperature ferromagnetism for spintronic applications. Iron and cobalt ions were inserted by ion implantation into thin SnO₂ films, which were grown by magnetron sputtering, resulting in various transition metal concentrations. In both types of samples SQUID measurements reveal a giant magnetic moment of up to 18 µ_B per transition metal atom. Optical ellipsometry and transmission spectroscopy show that the band gap of 3.6 eV is independent on the Co/Fe concentration. After annealing the samples at 400^∘C we observe an increase of the magnetic moment of up to 22 µ_B for 3 at.% Fe and a decrease to 8 µ_B per transition metal atom for 7 at.% Fe. A model is proposed to account for this unexpected behaviour.