Engineering Magnetic Anisotropy: The Role of Centrifugal Casting and Magnetic Fields in Strontium Ferrites

Abstract This study investigates the effect of centrifugal casting combined with an external magnetic field on the microstructural and magnetic properties of strontium ferrite magnets. By varying ferrite powder particle sizes and casting speeds, we explore their impact on particle orientation, density, and crystallographic texture in both bonded and sintered magnets. The findings reveal that small, single-domain particles align axially, while larger, multi-domain particles orient circumferentially, resulting in magnetic anisotropy dependent on particle size and casting conditions. At higher speeds, a gradient distribution of particles develops, enhancing magnetic anisotropy and achieving high density without additional degassing. Furthermore, initial attempts to apply this method to sintered magnets indicate that orientation effects, while present, are less pronounced than in bonded magnets. This work demonstrates the potential of centrifugal casting in a magnetic field as a method for producing gradient-structured magnets with controlled texture, providing a foundation for future advancements in anisotropic magnetic materials.