Effect of Extra Cation Substitution on Magnetic Anisotropy of La-Co Co-Substituted M-Type Sr Ferrite

La-Co co-substituted M-type ferrite magnets have large coercivities and are used as high-performance ferrite magnets in motors. Enhancing the uniaxial magnetic anisotropy of base materials by the substitution of Co2+ improves the coercivity. Since cobalt is a rare element, reducing its use is of great industrial importance. This study deals with the effect of a small amount of Al, Cr, and Mn substitution for Fe on the magnetic properties of La-Co co-substituted M-type ferrites without increasing the amount of Co. The additional substitution of Mn was observed to be advantageous in improving the magnetic anisotropy.