High frequency characteristics of nanocrystalline Co-Fe-Hf-O Soft magnetic films

Y. Hayakawa, K. Ohminato, N. Hasegawa, A. Makino

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1 Citation (Scopus)


The microstructure, electrical resistivity, and high frequency soft magnetic properties of nanocrystalline Co-Fe-Hf-O films were investigated. The films were prepared by rf reactive sputtering technique in Ar + O2 mixed atmosphere under a static magnetic field or no field. In an as-deposited state, a Co44.3Fe19.1Hf14.5O22.1 film deposited in a static field consists of mixed structure of amorphous phase and bcc nanocrystals with 3 - 4 nm in diameter. The real part (μ′) of complex permeability of 160 is almost constant up to 1GHz, and extremely high μ′/μ″ of 61 at 100 MHz is obtained. These high frequency characteristics are caused by the high electrical resistivity (ρ) of 13 μ Ω and large anisotropy field (Hk) of 4.8 kA/m.

Original languageEnglish
Pages (from-to)C1-495-C1-496
JournalJournal De Physique. IV : JP
Issue number1
Publication statusPublished - 1997 Mar
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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