INVESTIGATION OF MAGNETIC INTERACTION MECHANISMS.
Final rept., 15 Apr 65-14 Oct 66,
SPERRY RAND RESEARCH CENTER SUDBURY MASS
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The magnetic properties of KMnCl3, RbMnCl3 and CsMnCl3 have been investigated. The Neel points and exchange constants have been determined from magnetic susceptibility measurements. In KMnCl3 and CsMnCl3 the spin configurations are canted, producing weak ferromagnetism. Paramagnetic and antiferromagnetic resonance studies were performed, and the spectra have been interpreted in terms of two-sublattice models. From susceptibility measurements performed on NaMnF3, KCoCl3, KCuCl3, RbCoF3 and RbFeF3, it was found that these compounds have a canted antiferromagnetic configuration at low temperatures. The ordering temperatures and exchange constants have been determined. Antiferromagnetic resonance studies in NaMnF3 have been interpreted in terms of a two-sublattice model containing canting interactions due to both single-ion anisotropy and antisymmetric exchange. The effects of the canting mechanisms have been described and the internal fields used in the model have been determined from the resonance data. It was found that the antisymmetric exchange interaction is at least an order of magnitude larger than the single-ion canting mechanism. The results of the model are in good agreement with the experimental angular dependence of the field for resonance at 70 GHz. The results obtained from several related investigations are also reported. Author
- Inorganic Chemistry
- Electricity and Magnetism
- Nuclear Physics and Elementary Particle Physics