1. NMR Research Unit, University of Oulu, 90014 Oulu, Finland
2. Fibre and Particle Engineering Research Unit, University of Oulu, 90014 Oulu, Finland
3. National Centre for Nano Fabrication and Characterization, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
4. Materials and Mechanical Engineering, Centre for Advanced Steels Research (CASR), University of Oulu, 90014 Oulu, Finland