1. Department of Physics, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere, Finland
2. COMP Centre of Excellence, Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
3. Peter Grünberg Institut PGI-1 and Institute for Advanced Simulation IAS-1, Forschungszentrum Jülich, D-52425 Jülich, Germany
4. Nanoscience Center, Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
5. Peter Grünberg Institut PGI-1 and JARA/HPC, Forschungszentrum Jülich, D-52425 Jülich, Germany
6. German Research School for Simulation Sciences, FZ Jülich and RWTH Aachen University, D-52425 Jülich, Germany