Electronic and magnetic properties of 57Fe in NiCl2, NiBr2, NiI2 and CoI2 from Mossbauer spectroscopy

Results from an investigation by Mossbauer spectroscopy of approximately 1 at.% 57Fe in NiCl2, NiBr2, NiI2 and CoI2 are presented. In NiCl2 and NiBr2 the results are satisfactorily analysed by a crystal-field model, and new information concerning the magnetic spin arrangements has been obtained. At all temperatures below TN for NiCl2+57Fe, and at temperatures between TN and 23K for NiBr2+57Fe, the spins are along a hexagonal (210) direction. Below 23K the results from Mossbauer spectra of NiBr2+57Fe are consistent with a different magnetic structure. Optical spectra taken at several temperatures suggest that iron impurities modify the NiBr2 helical arrangement. Mossbauer spectra of NiI2+57Fe show extreme line broadening; possible explanations are discussed. Lastly, in CoI2+57Fe the results are consistent with a magnetic structure in which the spins lie in the basal plane.

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