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Autor

  • Barth, S. (1)
  • Bartsch, H. (1)
  • Bierlich, S. (1)
  • Capraro, B. (1)
  • Hesse, J. (1)
  • Naghib Zadeh, Hamid (1)
  • Rabe, Torsten (1)
  • Töpfer, J. (1)

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  • Cofiring (1) (entfernen)

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Integration of Ni-Cu-Zn and hexagonal ferrites into LTCC modules: Cofiring strategies and magnetic properties (2014)
Töpfer, J. ; Hesse, J. ; Bierlich, S. ; Barth, S. ; Capraro, B. ; Rabe, Torsten ; Naghib Zadeh, Hamid ; Bartsch, H.
We have studied the integration of Ni-Cu-Zn ferrite spinels as well as substituted hexagonal Co2Y-and M-type ferrites into LTCC (Low Temperature Ceramic Co-firing) modules. The cofiring behavior and the magnetic properties of these materials were investigated and evaluated for multilayer applications. Ni-Cu-Zn ferrites exhibit permeabilities of µ=300–500 for operating frequencies in the MHz range. Cu-substituted Y-type ferrites Ba2Co2-x-yZnxCuyFe12O22 in combination with sintering additives display sufficient shrinkage and densification at 900°C. A permeability of µ=10 is observed; however, substituted Co2Y-type ferrites do not exhibit long-term stability at 900°C. Co/Ti-substituted M-type ferrites BaFe12-2yCoyTiyO19 (y=1.2) with planar magneto-crystalline anisotropy exhibit excellent soft magnetic behavior. Using sintering additives, complete densification is reached at 900°C and a permeability of µ=15 and a resonance frequency of larger than 1?GHz are observed. Integration of ferrite multilayer inductor components into LTCC modules using free and constrained cofiring technologies is demonstrated.
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