1. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria and Department of Physics, Chemistry and Biology (IFM), Thin Film Physics Division, Linköping University, S-581 83 Linköping, Sweden
2. Department of Physics, Chemistry and Biology (IFM), Thin Film Physics Division, Linköping University, S-581 83 Linköping, Sweden
3. Materials Center Leoben Forschung GmbH, Roseggerstrasse 12, A-8700 Leoben, Austria
4. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria