Barium ferrite films grown on sapphire and oxidized silicon substrates exhibit a granular structure with cluster-like magnetic domains. On sapphire, high perpendicular anisotropy can be achieved.The films grown on SiO2 /Si develop textures with nearly in-plane c axis, which induce a large in-plane magnetization.
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Lisfi, A., & Lodder, J. C. (2002). Relation between the microstructure and magnetic properties of BaFe12O19 thin films grown on various substrates. Journal of magnetism and magnetic materials, 242-245, 391-394. https://doi.org/10.1016/S0304-8853(01)01233-1