1. CIC nanoGUNE, E-20018 Donostia-San
Sebastian, Spain
2. Department of Electricity
and Electronics, Faculty of Science and Technology, UPV/EHU, E-48080 Bilbao, Spain
3. Materials Physics
Center CSIC-UPV/EHU and Donostia International Physics Center, DIPC, E-20018 Donostia-San Sebastian, Spain
4. NanoSpin,
Department of Applied Physics, Aalto University School of Science, FI-00076 Aalto, Finland
5. Ikerbasque, Basque Foundation for Science, E-48013 Bilbao, Spain