1. Centre of Physics of Minho and Porto Universities (CF-UM-UP), Campus de Gualtar, Braga 4710-057, Portugal
2. National Institute of Materials Physics, 105 bisAtomistilor, Magurele 077125, Romania
3. BCAST, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom
4. Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, Esch/Alzette L-4362, Luxemburg
5. Department of Physics and Materials Science, University of Luxembourg, Rue du Brill 41, Belvaux L-4422, Luxembourg
6. IFIMUP & Department of Physics and Astronomy, Sciences Faculty, University of Porto, Rua do Campo Alegre, 687, Porto 4169-007, Portugal
7. Department of Physics, School of Basic and Applied Science, Central University of Tamil Nadu, Thiruvarur 610 101, India
8. Department of Physics, CICECO-Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal