M-type strontium ferrite-based biphase composite permanent magnetic ferrite block and preparation method thereof

The invention discloses an M-type strontium ferrite-based biphase composite permanent magnetic ferrite block and a preparation method thereof, and relates to the technical field of permanent magnetic ferrite preparation, so that the size of a soft magnetic phase is in a nanometer level, and the soft magnetic phase is uniformly distributed in a matrix. The preparation method comprises the following steps: respectively dissolving Fe (NO3) 3, Co (NO3) 2 and NaOH in water to prepare aqueous solutions, dropwise adding the NaOH solution into a mixed nitrate solution while stirring until the pH value is 9 to precipitate metal ions, transferring the obtained precipitation solution and precipitate into a hydrothermal reaction kettle, then adding SrFe12O19 ferrite nano powder, and carrying out hydrothermal reaction to obtain the SrFe12O19 ferrite nano powder. Arranging a magnetic field at the bottom of the reaction container to attract the generated CoFe2O4 ferrite to be deposited on the SrFe12O19 ferrite, and finally