Skin effect suppression for Cu/CoZrNb multilayered inductor

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The Cu/Co 85Zr 3Nb 12 multilayer is studied as a conductor of a spiral inductor to suppress the skin effect at the 5 GHz range (matches IEEE 802.11 a standard) using negative-permeability in CoZrNb films beyond the ferromagnetic resonance frequency. The skin effect suppression becomes remarkable when the thickness of Cu in each period of the multilayer, t Cu, is less than the skin depth of Cu at the targeting frequency. For the 5 GHz operation, t Cu ≤ 750 nm. The resistance of the Cu/CoZrNb multilayered spiral inductor decreases as much as 8.7, while keeping the same inductance of 1.1 nH as that of a similar air core. Accordingly, Q 16. Therefore, the proposed method can contribute to realize a high-Q spiral inductor. We also study the potentially applicable frequency of this method. Given a soft magnetic material with M s 105 emu/cc and H k = 5 Oe, the method can be applied at 700 MHz, the lowermost carrier frequency band for the 4th generation cellular phone system.

Original languageEnglish
Article number07A501
JournalJournal of Applied Physics
Issue number7
Publication statusPublished - 2012 Apr 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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