Abstract
Magnetic materials with broad ferromagnetic resonance (FMR) range have great potential in microwave absorption field. In this work, M type barium ferrites with local chemical gradients were prepared by mixing and heating the ferrite powders with different Zr4+-Ni2+ contents, constructing the locally inhomogeneous magnetocrystalline anisotropy field to widen the FMR range. The results show that ionic diffusion process starts significantly at 1000 °C. The mixed ferrite reheated at 1100 °C finally exhibits the broadest FMR range (7.32 GHz) because of the appropriate gradient composition design, which is much wider than that of the original uniformly substituted barium ferrites.
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