Abstract
The magnetic anisotropy change of Co-Ti substituted Sr-M hexaferrite has been investigated by using general gradient approximation (GGA) with on-site coulomb repulsion added (GGA + U) and force theorem method. The calculated dependence of magnetic anisotropy energy on angles of SrFe12O19 fits very well with theoretical description, and anisotropy constant K1 agrees well with experimental value. The impact of occupancy of Co2+ and Ti4+ on magnetic anisotropy in SrCo2Ti2Fe8O19 has been studied. The results show that Co2+ in 4f2 site and Ti4+ in 12 k site both contribute to the reduction of uniaxial magnetic anisotropy, and as Co2+ and Ti4+ in their first preference of substitution site, magnetic anisotropy of SrCo2Ti2Fe8O19 is weak, which would facilitate the formation of conical magnetic structure to induce electric polarization. As substitution rate x increases from 0 to 3, the magnetic anisotropy of SrCoxTixFe12−2xO19 is found to change from uniaxial to planar.
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