Resonance in Magnetically Ordered Crystals with Anisotropic g Factors

Abstract
The equations of motion of the sublattice moments are discussed in the case of anisotropic g factors when the lengths of mechanical moments are conserved, or are not conserved. Experimental data on magnetic resonance in hexagonal ferrimagnet RbNiF3 and orthorhombic canted antiferromagnet NaNiF3 are interpreted on the basis of such equations with the suggestion that the lengths of mechanical moments are conserved. It is shown that for both crystals the g‐factor anisotropy must be taken into account.