1. CEA, LIST, Diamond Sensors Laboratory, F-91191 Gif-sur-Yvette, France
2. ESIEE−ESYCOM University Paris Est, Cité Descartes, BP99, 93162 Noisy Le Grand, France
3. Institut Néel, UPR CNRS 2940, 25 Rue des Martyrs, BP 166, F-38042 Grenoble, France
4. CEA, INAC, SPrAM UMR 5819 (UJF, CNRS, CEA), F-38054 Grenoble, France