Structure and isotropic high-frequency response of Co-HfN nanogranular films

Yang Cao, Yiwen Zhang, Shigehiro Ohnuma, Nobukiyo Kobayashi, Hiroshi Masumoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The Co-HfN nanogranular films with different Co content were deposited, to obtain high-frequency soft magnetic properties. The films exhibit perpendicular magnetic anisotropy over a wide composition range. The coercivity is ∼ 15-75 Oe, which is attributed to the growth-induced Co columnar structure. Both hysteresis loops and magnetic force microscopy images demonstrate that the films are magnetically in-plane isotropic. The permeability and ferromagnetic resonance frequency of the Co58Hf14N28 films are 40 and 2 GHz, respectively, which is consistent with the theoretical calculation based on Landau-Lifshitz-Gilbert (L.L.G) equation. The films consist of crystallized Co nanogranules and amorphous HfN matrix.

Original languageEnglish
Article number7113862
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2015 Nov 1


  • Cobalt alloys
  • frequency response
  • perpendicular magnetic anisotropy
  • soft magnetic materials


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