Permanent magnetic ferrite and preparation method and application thereof

The present invention belongs to the field of magnetic materials, and discloses a permanent magnetic ferrite, which comprises a ferrite main phase having a molecular formula of A1-x-y CaxLayFe2n-z MzO19, wherein A is Sr or/and Ba, and M is a combination of Co and at least one of Ni and Zn; x, y and z represent the adding molar weight of each main metal element, the value range of x is 0.3-0.42, the value range of y is 0.35-0.5, the value range of z is 0.20-0.3, and the value range of n is 5.50-5.79; the permanent magnetic ferrite also comprises an additive phase, and the additive phase is a compound containing B, Si, Ca, La, Co or Sr and other elements. The permanent magnetic ferrite has excellent magnetic properties. The invention further discloses a preparation method of the permanent magnetic ferrite, a high-speed grinding technology is adopted in preparation, the production time can be greatly shortened while the performance of the permanent magnetic ferrite is not affected, and the production efficiency