Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 28: Surface or interface magnetism

O 28.2: Vortrag

Dienstag, 23. März 2010, 10:45–11:00, H48

Spin Polarized PES on interface states of MgO/Fe/GaAs(100) — •Daniel Gottlob^{1, 2}, Lukasz Plucinski², Carsten Westphal¹, and Claus M. Schneider² — ¹Experimentelle Physik 1 - Technische Universität Dortmund, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany — ²Institurte of Solid State Research - IFF-9 Electronic Properties - Research Center Jülich, D-52425 Jülich, Germany

Spintronics is an important field of current Solid State Research and Magnetic Tunnel Junctions (MTJ’s) now are within our grasp. In MTJ’s the nature of the electronic structure at the interface determins the tunneling process, and thereby the magnetoresistive potential of the MTJ.

Electronic interface states can have influence on the tunneling process in epitaxial MTJs especially for thinner tunnel barriers. At our ongoing research we will take a closer look at an off-normal surface state of Fe/GaAs(100) and see whether it still exists as an interface state if we cap the Fe by 1-3 monolayers of MgO. We will collect spin-polarized spectra to confirm the spin polarization in this band after the evaporation of MgO.

The measurements take place at Beamline 5 at DELTA, Dortmund, with a unique detector setup. We can acquire 2-dimensional angle resolved data for band mapping and spin-polarized one-dimensional data quasi-simultaneously. Our samples are prepared in-situ by e-beam evaporation and characterized by LEED and Auger spectroscopy.