1. Departament de Física, Universitat Autònoma de Barcelona, Cerdanyola del Vallès E-08193, Spain
2. IMN-Instituto de Micro y Nanotecnología (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, Madrid 28760, Spain
3. Univwesity of Grenoble Alpes, CEA, CNRS, Spintec, Grenoble 38000, France
4. Institut Universitaire de France, Paris 75231, France
5. Department of Physics, Georgetown University, Washington, District of Columbia 20057, United States
6. Catalan Institute of Nanoscience and Nanotechnology (ICN2), Campus UAB, Bellaterra, Barcelona E-08193, Spain
7. Institute of Radiation Physics, Helmholtz-Zentrum Dresden−Rossendorf, Dresden 01328, Germany
8. Institut de Microelectrònica de Barcelona, IMB-CNM (CSIC), Campus UAB, Bellaterra, Barcelona E-08193, Spain
9. Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, Barcelona E-08010, Spain