1. Wihuri Physical Laboratory, Department
of Physics and Astronomy, University of Turku, Turku FI-20014, Finland
2. IFW Dresden, P.O. Box 27 01 16, D-01171 Dresden, Germany
3. Institut für Physik, Martin Luther University Halle-Wittenberg, Von-Seckendorff-Platz 1, 06120 Halle, Germany
4. Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
5. Materials Research
Laboratory, Department of Physics and Astronomy, University of Turku, Turku FI-20014, Finland
6. NanoSpin,
Department of Applied Physics, Aalto University School of Science, P.O.
Box 15100, FI-00076 Aalto, Finland