1. Electron Microscopy for Materials Research (EMAT), Department of Physics, University of Antwerp, BE-2020 Antwerpen, Belgium
2. NANOlab Center of Excellence, University of Antwerp, BE-2020 Antwerpen, Belgium
3. CNR-SPIN, I-84084 Fisciano, Salerno, Italy
4. Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, I-84084 Fisciano, Salerno, Italy
5. International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02668 Warsaw, Poland
6. CNR-SPIN, I-80126 Napoli, Italy
7. Dipartimento di Fisica, Università di Napoli, I-80126 Napoli, Italy