CATION DISTRIBUTION AND INTRINSIC MAGNETIC-PROPERTIES OF CO-TI-DOPED M-TYPE BARIUM FERRITE

The structural and magnetic properties of BaFe12-2xCo(x)Ti(x)O19 (0 less-than-or-equal-to x less-than-or-equal-to 1.0) M-type barium ferrite have been investigated by means of neutron powder diffraction and high-field magnetization measurements. The cationic distribution and magnetic moments of the five different metallic sublattices are determined and compared to the experimental saturation magnetization. It is found that about 50% of Co ions occupy tetrahedral sites, thus being ineffective in the reduction of the uniaxial magnetic anisotropy, while Ti ions prefer the 4f(VI) octahedral sites. All in all, a clear hierarchy of sublattice preferences is defined. Although the collinearity of the magnetic structure is progressively broken, mainly above x almost-equal-to 0.7, the overall behavior remains ferrimagnetic. The strong local spin canting is tentatively attributed to the localization of diamagnetic Ti ions in the 4f(VI) octahedral sites.