Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Surface magnetism II (jointly with MA)
O 55.3: Vortrag
Mittwoch, 16. März 2011, 15:30–15:45, CHE 184
Fe/GaAs(001) and MgO/Fe/GaAs(001) epitaxial systems: A spin- and angle-resolved photoemission study — •Daniel Gottlob1,2, Lukasz Plucinski1, Carsten Westphal2, and Claus M. Schneider1 — 1Forschungszentrum Jülich GmbH — 2Technische Universität Dortmund
Spintronics is an inportant field of current Solid State Research and memory units based on Magnetic Tunnel Junctions (MTJs) are now within reach. In MTJ’s the nature of the electronic structure at the interface determines the spin-selectivity of the tunneling process, and thereby the magnetorestive potential of the MTJ.
Electronic interface states can influence the tunneling process in epitaxial MTJs especially for thinner tunnel barriers. The research that has been done at Beamline 5, DELTA, Dortmund in the context of a Diploma thesis focussed on the electronic structure of Fe/GaAs(001) and MgO/Fe/GaAs(001) and a surface/interface state of these systems. The samples have been prepared in situ by molecular beam epitaxy and characterized by LEED and Auger spectroscopy.
The electronic structure was probed in two different regions of the Brillouin zone, which have been chosen for reference (normal emission, Γ point) and the expectation of the surface state (21∘ off normal) that has been seen on Fe/W(001) in a previous study [1]. Measurements on the MgO capped iron sample have been conducted to confirm whether the surface state does transform into an interface state.
[1] L. Plucinski, Y. Zhao, C.M. Schneider, B. Sinkovic, and E. Vescovo; Phys. Rev. B 80, 184430 (2009)