Magnetic Properties of ZnSe Crystals doped with Transition Metals

The magnetic properties of ZnSe:Fe, ZnSe:Mn and ZnSe:Cr crystals are investigated. It is established that magnetic properties of ZnSe:Fe differ from magnetic properties of ZnSe doped with other transition metals, for example Cr2+ or Mn2+, because of Fe2+ ions ground state has a permanent magnetic moment. For ZnSe crystals doped from Zn+Fe the two subsystems are observed: paramagnetic and anti‐ferromagnetic with TC = −130 K (B = 67 G). It is shown that ZnSe:Fe magnetic properties are sensible to the crystals doping technique. We proposed a model, that explains formation of the few magnetic phases (paramagnetic, antiferromagnetic and “spin‐glass” phase) in ZnSe:Fe as result of nonuniform doping and formation of the impurity clusters in crystal. It is shown that the most uniform crystal doping may be obtained in case of doping during the growth process or at thermal annealing in Bi melt.