School of Physics and Electronics;
Central South University;
Changsha 410083;
China;
Institute of Physics;
Maria Curie Sklodowska University;
20-031 Lublin;
Poland;
Department of Physics and Astronomy;
Uppsala University;
Box 516;
S-75120 Uppsala;
Sweden;
Department of Physics;
Chalmers University of Technology;
41296 Goteborg;
Sweden;
Department of Applied Physics;
KTH Royal Institute of Technology;
Alba Nova;
10691 Stockholm;
Sweden;
Condensed Matter and Magnet Science Group;
Los Alamos National Laboratory;
Los Alamos;
New Mexico 87545;
USA;