1. School of Materials Science and Engineering Changzhou University Changzhou 213164 P. R. China
2. Jiangsu Key Laboratory of Materials Surface Science and Technology National Experimental Demonstration Center for Materials Science and Engineering, Sino-Russian Joint Laboratory of Functional Nanostructured Materials Changzhou University Changzhou 213164 P. R. China
3. Department of Physics Ufa State Aviation Technical University 12 K. Marx St. Ufa 450008 Russia