No abstract

Because of their several attractive features including relatively high Curie temperatures, substituted lithium ferrites have become important for applications at microwave frequencies. N~el collinear arrangement of spins on A and B sublattices is unable to satisfactorily explain the 0°K saturation moments and the observed Curie temperatures of the zinc-substituted lithium ferrites, especially at concentrations of zinc z > 0-3 in the formula Lio.s-~/2 Zn, Fe 2.s _ ,/2 04. Rosencwaig's localized canting model has been extended and used to compute 0 ° K magnetic moments and Curie temperatures of these ferrites with substitution levels up to z = 0-7. Reasonably good agreement between the calculated and experimental values, both for the 0°K magnetic moments and the Curie temperatures, has been obtained using exchange parameters ratios based on the values J, =-20°K, J~-8°K and Jab = J~ =-29OK.

No abstract

No abstract

No abstract