Sub-100 μm scale on-chip inductors with CoZrTa for GHz applications

Wei Xu, Hao Wu, Donald S. Gardner, Saurabh Sinha, Tawab Dastagir, Bertan Bakkaloglu, Yu Cao, Hongbin Yu

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21 Scopus citations


On-chip inductors with magnetic material are fabricated with complementary metal-oxide semiconductor processes. The inductors use copper metallization and amorphous CoZrTa thinfilms. Enhancements of 3.5X in inductance and 3X for the quality factor at frequencies as highas 3 GHz have been successfully demonstrated by using a continuous CoZrTa-ring structure in spiral inductors at the 100 μm scale. Further improvement of the frequency response of inductance up to 6 GHz was achieved by micro-patterning the magnetic film. The effect ofincreasing the film thickness on the performance of strip line inductors was measured and modeled. This work demonstrates significantly larger increases in inductance and quality factor atabove 1 GHz as compared to prior efforts, thereby making the added processing cost worthwhile.

Original languageEnglish (US)
Article number07A316
JournalJournal of Applied Physics
Issue number7
StatePublished - Apr 1 2011
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by National Science Foundation Grant No. 0727100.


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