Abstract
Polycrystalline U-type hexaferrite with compositions of Ba4Zn2−xCoxFe36O60 (x = 0.4, 0.6, 0.8, 1.2) were synthesized via a conventional ceramic method. The phase and structure were systemically studied by XRD. The magnetic property was characterized by VSM. The single domain critical size has been experimentally determined. The relationships between ferromagnetic resonance and applied external field of samples with different magneto-crystalline anisotropy fields are confirmed. The result tells a smaller external field is needed to reach resonance with higher magneto-crystalline anisotropy in our sample. We also confirm the relation between magneto-crystalline anisotropy and ferromagnetic resonance linewidth.
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