1. Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH; 52425 Jülich Germany
2. Faculté des Sciences, Université de Liège; 4000 Liège Belgium
3. Faculty of Engineering and Center for Nano-integration Duisburg-Essen (CENIDE), University of Duisburg-Essen; 47057 Duisburg Germany
4. Peter Grünberg Institut PGI-5, Forschungszentrum Jülich GmbH; 52425 Jülich Germany
5. Institut Laue Langevin, 71 Avenue des Martyrs; 38000 Grenoble France
6. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge; Tennessee 37831 USA