1. Physics Department, Oakland University, Rochester, Michigan 48409, USA
2. Electrical and Computer Engineering, Oakland University, Rochester, Michigan 48309, USA
3. Institute of Electronic Information Systems, Novgorod State University, Veliky Novgorod, Russia
4. Moscow State Technical University of Radio Engineering, Electronics and Automation, Moscow 19454, Russia
5. Institute of Metal Physics, Ural Division of Russian Academy of Sciences, 18 S. Kovalevskaya St, Ekaterinburg 620990, Russia