High-frequency soft magnetic properties of isotropic Co-Al-N films

Hanae Kijima, Shigehiro Ohnuma, Hiroshi Masumoto

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Co-Al-N films with wide Co compositional range were prepared by the rf-sputtering method in order to obtain soft magnetic properties at high frequencies. The films consisted of Co nano-granules 3-5 nm in diameter, randomly dispersed in an AlN amorphous matrix. Ferromagnetic properties were obtained in the film with a Co content of 47-80 at.%. The films were shown perpendicular magnetic anisotropy with coercivity around 20-50 Oe, and had the same magnetization curve in all film plane directions. Co-Al-N films showed an excellent frequency response of permeability. The permeability (μ) of Co 80Al14N6 film, in particular, was constant up to 1 GHz, and exhibited a clear peak at the resonance frequency (fr) at around 1.2 GHz. The origin of this specific μ -f response of isotropic Co-Al-N films with perpendicular magnetic anisotropy can be attributed to the rotatable magnetic anisotropy.

Original languageEnglish
Article number6027703
Pages (from-to)3928-3931
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 2011 Oct


  • CoAlN film
  • frequency response
  • isotropic
  • perpendicular magnetic anisotropy
  • rotatable anisotropy
  • soft magnetic film
  • stripe domain

ASJC Scopus subject areas

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


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