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

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

doi:10.1109/TMAG.2015.2438003

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

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

FRIS - Advanced Interdisciplinary Research Division

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 language	English
Article number	7113862
Journal	IEEE Transactions on Magnetics
Volume	51
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2015.2438003
Publication status	Published - 2015 Nov 1

Keywords

Cobalt alloys
frequency response
perpendicular magnetic anisotropy
soft magnetic materials

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10.1109/TMAG.2015.2438003

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abstract = "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.",

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T1 - Structure and isotropic high-frequency response of Co-HfN nanogranular films

AU - Cao, Yang

AU - Zhang, Yiwen

AU - Ohnuma, Shigehiro

AU - Kobayashi, Nobukiyo

AU - Masumoto, Hiroshi

PY - 2015/11/1

Y1 - 2015/11/1

N2 - 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.

AB - 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.

KW - Cobalt alloys

KW - frequency response

KW - perpendicular magnetic anisotropy

KW - soft magnetic materials

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

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