Tuning of magnetic properties of aluminium-doped strontium hexaferrite powders
Ma Xiao-Mei, Liu Jie, Zhu Sheng-Zhi, Shi Hui-Gang†,
       

Scanning electron micrographs of SrAlxFe2n−xO19 magnetic powder particles with (a) x = 0, (b) x = 0.8, (c) x = 1.4, (d) x = 2.0.