Relationship between Magnetic Properties of YIG Ferrites and Intermodulation Characteristics of Microwave Isolators

  • Nukaga, Masako (Materials Research Center, TDK Corporation Aza-Matsugashita Minami-Hatori) ;
  • Henmi, Sakae (Materials Research Center, TDK Corporation Aza-Matsugashita Minami-Hatori)
  • Published : 2000.09.01

Abstract

The generation of the intermodulation noises in microwave isolators has been studied in relation to the characteristics of YIG ferrites designed for this application. We have investigated the influences of porosity and crystalline anisotropy related to the magnetic loss, which causes the generation of intermodulation signals. The power dependence of the intermodulation power level is stressed as the crystalline anisotropy decreases. These results are consistent with the nonlinear effects of a single normal mode before the excitation of the spin-waves. It also appears that this power level is proportional to the magnitude of dc bias magnetic field.

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References

  1. IEEE Trnas.Microwave Theory Tech v.45 no.2 Nonlinear Intermodulation Coupling in Ferrite Circulator Junctions H.How,C.Vittoria;R.Schmidt
  2. A.I.E.E.E. v.91 E.Schloann
  3. J.Phys.Chem.Solide v.6 Spin-wave Analysis of Ferromagnetic Resonance in Polycrystalline Ferrites E.Schlvann
  4. IEEE Trans Magn v.8 no.3 Magnetic Properties and Resonance Linewidths of Zr and Ti-Substituted Ca-V Garnet Y.Machida,Y.Nakayama,H.Saji,T.Yamadaya;M.Asanuma
  5. IEEE Trans Magn v.11 no.5 Separation of Anisotropy and Porosity Contributions to Inhomogeneous Broadened FMR Linewidth in Polycrystalline YIG P.Rochmann,
  6. in Magnetism v.1 Ferromagnetic Resonance at High Power R.W.Damon,G.T.Rado;H.Suhl