1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta St., 30-059 Kraków, Poland
2. Department of Solid State Physics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland
3. Department of Engineering of Cast Alloys and Composites, Faculty of Foundry Engineering, AGH University of Science and Technology, 23 Reymonta St., 30-059 Kraków, Poland
4. A. Chelkowski Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007Katowice, Poland
5. Departament de Fisica, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, Palma de Mallorca E-07122, Spain