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 20.24: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magnetic and structural properties of thin iron layers on (110)-cleavage faces of InAs and GaAs — •Christian Urban1, Ulrich Köhler1, Fang-Yuh Lo2, Dirk Reuter2, Andreas D. Wieck2, Detlef Spoddig3, and Ralf Meckenstock3 — 1Experimentalphysik / Oberflächenphysik, Ruhr-Universität Bochum, Germany — 2Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany — 3Experimentalphysik / Festkörperspektroskopie, Ruhr-Universität Bochum, Germany
The construction of a UHV-MOKE system which is integrated into an existing STM-setup is described. The geometrical arrangement allows to measure hysteresis loops directly while a film is deposited. Iron layers on the (110) side walls of UHV-cleaved InAs- and GaAs-wafers were investigated up to a coverage of 100 ML. STM shows for room temperature growth a granular structure where step edges of the substrate do not influence the nucleation. MOKE data show in agreement with FMR a strong uniaxial magnetic anisotropy on both substrates. The dependence of the magnetic behavior on the coverage was studied with MOKE and correlated with structural data obtained by STM. Iron cleaved-edge-overgrowth was used to obtain an ohmic contact to a 2D-Electron gas in the In-rich channel of a GaAs-HEMT-structure with no indication of the formation of a Schottky barrier.