1. University Grenoble-Alpes, 38000 Grenoble, France
2. CEA-Grenoble, INAC-PHELIQS, 17 avenue des Martyrs, 38000 Grenoble, France
3. Institut Nèel, CNRS, 25 avenue des Martyrs, 38000 Grenoble, France
4. I. Physikalisches Institut, Justus-Liebig-Universitt Gießen, 35392 Gießen, Germany
5. Institut
Catalá de Nanociència i Nanotecnologia (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
6. Instituciò Catalana de Recerca
i Estudis Avançats (ICREA), 08193 Barcelona, Catalonia, Spain