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 20.95: Poster

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

Two-dimensional electron gases subjected to modulated magnetic potentials — •R. Dinter, S. Pütter, H. Stillrich, H.P. Oepen, and W. Hansen — Institute for Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg

We study two-dimensional electron gases (2DEGs) subjected to modulated potentials and magnetic fields. The goal is to investigate the energy splitting of the Landau levels due to field modulations with periods less than 100 nm by magneto-transport measurements. The 2DEGs are prepared in GaAs/AlGaAs and InAs shallow HEMTs grown by MBE, where they are located some ten nanometres below the surface. A modulated potential is achieved by preparing nanomagnets with mask techniques directly on the samples. The nanomagnets are produced by sputter-deposition of Co/Pt multilayers through different types of masks. The magnetic properties of the nanostructures are studied via the magneto-optical Kerr effect and scanning electron microscopy with polarization analysis. Transport measurements are performed in Hall bar geometry at temperatures between 4.2 K and 30 mK.

We discuss the preparation in detail and results of the magnetic characterization as well as magneto-transport measurements.