FMR and Static Magnetic Properties of Gallium Substituted Magnetoplumbite

Magnetization and uniaxial anisotropy were studied on single crystals of PbFe 12-x Ga x O 19 , where x = 0 - 8 from 2 to 360 K. The results suggest that for x > 3 the spin arrangement becomes non-collinear. The magnetic moment and anisotropy for x < 3 are roughly consistent with the random distribution of Ga 3+ ions in all sites except for 2b. For x = 5.94 and 8.02 the relatively large anisotropy of the Curie temperature was found. The FMR measurements at T = 300 K were interpred using the g-tensor formulation.