1. Université Clermont Auvergne, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000 Clermont-Ferrand, France
2. Faculty of Physics, Saint Petersburg State University, Universitetskaya Embankment 13B, 199034 Saint Petersburg, Russia
3. IBM Research Europe─Zürich, Saumerstrasse 4, 8803 Rüschlikon, Switzerland
4. Université Grenoble Alpes, CNRS, Institut Neel, 38000 Grenoble, France
5. Université Côte d’Azur, CNRS, CRHEA, Rue Bernard Gregory, 06560 Valbonne, France
6. Centre for Nanoscience and Nanotechnology & Department of Electronic and Electrical Engineering, University of Bath, BA2 7AY Bath, U.K.
7. Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S4L7, Canada