Hyperfine magnetic field on nuclei of Fe2+ nonmagnetic ions in ferromagnetic Cosub(0,97)Fesub(0,03)S2

By the method of the Moessbauer effect it is found that the direction of the hyperfine field indirectly induced at the nuclei of the nonmagnetic Fe2+ ions and the direction of the magnetization of the Co2+ ions inducing the field are opposite. The mechanism, previously only assumed, in which the field is induced via spin-density transfer from the esub(g) subband of Co2+ to the unoccupied esub(g) band of the nonmagnetic iron is thereby displayed experimentally. The electric-field gradient Vsub(zz) is shown to be positive. In addition, the experimental results confirm the assumptions about the angular structure of the Co2+ moments. The measurements were carried out in external magnetic fields up to 60 kOe at T=4.2 K