Magnetic anisotropy of Sr-ferrite powder produced by mechanical alloying

Sr-ferrites were prepared by mechanical alloying and subsequent annealing, and development of anisotropic nature of the Sr-ferrite powders during post-synthesis milling were investigated. The Sr-ferrites in as-synthesised state exhibited poor anisotropic nature, and this was attributed to the unique microstructure of the particle consisting of randomly oriented ultra-fine grains. Anisotropic nature of the Sr-ferrite was developed and improved by the post-synthesis milling, and this was explained by the disintegration of the crystal aggregates into individual grains