1. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology (BIST), Campus UAB, Bellaterra, 08193 Barcelona, Spain
2. Univ. Grenoble Alpes, CEA, IRIG-MEM, 38000 Grenoble, France
3. Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG-SPINTEC, 38000 Grenoble, France
4. Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain