The field nature of spin for electromagnetic particle
  The field nature of spin in the framework of the field electromagnetic particle concept is considered. A mathematical character of the fine structure constant is discussed. Three topologically different field models for charged particle with spin are investigated in the scope of the linear electrodynamics. A using of these field configurations as an initial approximation for an appropriate particle solution of nonlinear electrodynamics is discussed. 
Alexander A. Chernitskii