1. KU Leuven; Instituut voor Kern- en Stralingsfysica; Celestijnenlaan 200 D 3001 Leuven Belgium
2. Catalan Institute of Nanoscience and Nanotechnology (ICN2); CSIC and The Barcelona Institute of Science and Technology; Campus UAB; Bellaterra 08193 Barcelona Spain
3. ICREA, Pg. Lluís Companys 23; 08010 Barcelona Spain
4. KU Leuven; Laboratorium voor Vaste-Stoffysica en Magnetisme; Celestijnenlaan 200 D 3001 Leuven Belgium
5. NIST Center for Neutron Research; National Institute of Standards and Technology; Gaithersburg Maryland 20899 USA
6. Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ); Forschungszentrum Jülich GmbH; 85747 Garching Germany