Zn-Ti-substituted M-type hexaferrites with large magnetocrystalline anisotropy and narrow ferromagnetic resonance linewidth for millimeter-wave self-biased application

Abstract

Large magnetocrystalline anisotropy field H_a and narrow ferromagnetic resonance (FMR) linewidth ΔH are obtained for M-type hexaferrites Ba(ZnTi)_xFe_12-2xO₁₉ (BaM, x = 0.0 - 0.5) via the introduction of Zn-Ti co-substitution. Meanwhile, c-axis orientation provides effective access to the enhanced squareness ratio M_r/M_s. These gyromagnetic properties make the developed BaM particularly suitable as a substrate for a self-biased circulator at U band. Raman Spectroscopy indicates that Zn²⁺-Ti⁴⁺ ions tend to preferentially occupy the 4f₁ and 4f₂ sites as x < 0.1, and then gradually spread across all available sites as x increases, which is consistent with the trend observed in saturation magnetization M_s. Outstanding magnetic properties are simultaneously achieved at x=0.1, including M_s = 55.84 emu/g, H_a = 11,930 Oe, and M_r/M_s = 0.87. In particular, the narrowest FMR linewidth (ΔH = 289 Oe at 59 GHz) is realized as x = 0.2, lower than previously reported values for BaM.

Keywords

M-type hexaferrites / Zn²⁺-Ti⁴⁺ substitution / self-biased circulators / narrow ferromagnetic resonance linewidth.

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