1. CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon and CEMOP/UNINOVA, 2829-516 Caparica, Portugal
2. Department of Physics and Nanotechnology, SRM University, Kattankulathur, Chennai, Tamil Nadu 603203, India
3. I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal