Localized Spin Canting in Lithium-Zinc Ferrite.

Lithium ferrite exhibits octahedral B site spin canting when the tetrahedral A site is diluted with diamagnetic zinc. One approach to modeling this effect is to split the B lattice into B^' and B^{''} sublattices which cant symmetrically about the axis of the A lattice. The local effective field is then considered for a given B^' spin in an environment which is canted to some average angle. This model is cast in terms of the exchange integrals which characterize the spin-spin interaction. A uniform canting model and three self-consistent localized models have been developed and evaluated using magnetization and high field incremental susceptibility data taken at 4 degrees Kelvin. A reasonable qualitative fit is achieved with a single set of exchange integrals when zinc content is less than 0.7 zinc atoms per formula unit.