1. Biomacromolecular Systems and Processes Institute of Biological Information Processing (IBI‐4) Forschungszentrum Jülich D‐52425 Jülich Germany
2. Dipartimento di Fisica Sapienza Universita di Roma Piazzale A. Moro 5 Roma 00185 Italy
3. Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI JARA‐FIT Forschungszentrum Jülich D‐52425 Jülich Germany