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O: Fachverband Oberflächenphysik
O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)
O 60.34: Poster
Wednesday, March 16, 2011, 17:30–21:00, P4
Growth and electronic structure of MgO1−xNx on Mo(001) investigated by scanning tunneling microscopy/spectroscopy — •Martin Grob, Christian Pauly, Mike Pezzotta, Marco Pratzer, and Markus Morgenstern — II. Physikalisches Institut B, Otto-Blumenthal-Straße, RWTH Aachen University and JARA-FIT, 52074 Aachen
Theoretical calculations [1] predict nitrogen-doped MgO being a ferromagnetic half metal. Therefore we investigated MgO1−xNx films on Mo(001) by scanning tunneling microscopy (STM) and spectroscopy (STS) at room temperature. The films were prepared by evaporation of magnesium in oxygen/nitrogen atmosphere. A concentration of up to x=6 % has been achieved in films up to 11 monolayers. Similarities and differences of pristine MgO and MgO1−xNx were observed by STM. The electronic structure measured by STS differs in a significant way, showing additional states appearing in the band gap of MgO. The influence of the Mo substrate taking affect as a catalizer for N-dissociation is discussed as well as possible solutions in order to prepare N-doped MgO bulk for further magnetic investigations.
[1] P. Mavropoulos, M. Ležaić, and S. Blügel, Phys. Rev. B 80, 184403 (2009).