Integrated RF on-chip inductors with patterned Co-Zr-Ta-B films

Hao Wu, Donald S. Gardner, Wei Xu, Hongbin Yu

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Integrated on-chip inductors with boron-incorporated amorphous Co-Zr-Ta-B films for reducing the size of the inductor and increasing the quality factor are presented. A 3.5-fold increase in inductance and a 3.9-fold increase in quality factor over inductors without magnetic films are measured at frequencies as high as 1 GHz. The Co-Zr-Ta-B films are patterned into the shape of fingers in the magnetic via region to improve the on-chip inductors, high frequency response. Compared with nonpatterned films, finger-shaped magnetic vias result in at least a 30% increase in quality factor in the gigahertz range. It is also demonstrated that by using laminations, an up to 9.1X inductance increase with good frequency response up to 2 GHz can be achieved.

Original languageEnglish (US)
Article number6333023
Pages (from-to)4123-4126
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number11
StatePublished - 2012


  • Co-Zr-Ta-B
  • Magnetic thin film
  • On-chip inductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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