Abstract

Combining various types of ferrites brings about magnetic properties desirable for different applications. This study aims to modify barium hexaferrite (BaFe<inf>12</inf>O<inf>19</inf>) by physically mixing it with cobalt ferrite (CoFe<inf>2</inf>O<inf>4</inf>). BaFe<inf>12</inf>O<inf>19</inf>/CoFe<inf>2</inf>O<inf>4</inf> magnets were produced by ball-milling and pressing solegel-derived ferrite powders. The ferrite composites showed variations in magnetic properties from BaFe<inf>12</inf>O<inf>19</inf> magnets with a saturation magnetization of 69.46 emu/g and a maximum energy product of 0.4529 MGOe. For the BaFe<inf>12</inf>O<inf>19</inf>:CoFe<inf>2</inf>O<inf>4</inf> weight ratio of 4:1, both saturation and remanent magnetizations were increased due to the addition of CoFe<inf>2</inf>O<inf>4</inf> with high magnetizations. However, the magnetizations were reduced when the BaFe<inf>12</inf>O<inf>19</inf>:CoFe<inf>2</inf>O<inf>4</inf> ratio was reduced to 2:1. On the other hand, the coercivity was monotonously decreased with increasing CoFe<inf>2</inf>O<inf>4</inf>. Interestingly, the maximum energy product in this study was linearly decreased with the bulk density of the magnets from 3.59 to 3.15 g/cm³. It is concluded that magnetic properties could be modified from a facile physical mixing of ferrites.