1. Department of Civil and Mechanical Engineering, Technical University of Denmark, Kgs. Lyngby 2800, Denmark
2. Materials and Nanotechnology, SINTEF Industry, Trondheim N-7465, Norway
3. Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
4. Department of Physics, NTNU, Norwegian University of Science and Technology, 7491 Trondheim, Norway