Wissbauer Experiments in External Magnetic Fields

A strong magnetic field produced by a superconducting magnet is very useful for Mossbauer spectroscopic investigations. The following results were obtained utilizing the high field Mossbauer technique. (1) Impurity Fe in 7-Mn has no localized magnetic moment. (2) The transferred hyperfine magnetic field at Fe in ferromagnetic CoS2 was determined. (3) The ion distribution in the man-ganese ferrite prepared by a wet method was estimated and the spin arrangement was confirmed to be collinear. (4) An unusual behavior was observed in the field dependence of vivianite, Fe3(PO4)2-8H20; only one of the two Fe sites showed a spin flipping phenomenon