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

Hanae Kijima; Shigehiro Ohnuma; Hiroshi Masumoto

doi:10.1109/TMAG.2011.2154302

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

Hanae Kijima, Shigehiro Ohnuma, Hiroshi Masumoto

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

14 Citations (Scopus)

Abstract

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 (f_r) 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 language	English
Article number	6027703
Pages (from-to)	3928-3931
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	47
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2011.2154302
Publication status	Published - 2011 Oct

Keywords

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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10.1109/TMAG.2011.2154302

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title = "High-frequency soft magnetic properties of isotropic Co-Al-N films",

abstract = "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.",

keywords = "CoAlN film, frequency response, isotropic, perpendicular magnetic anisotropy, rotatable anisotropy, soft magnetic film, stripe domain",

author = "Hanae Kijima and Shigehiro Ohnuma and Hiroshi Masumoto",

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AU - Ohnuma, Shigehiro

AU - Masumoto, Hiroshi

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N2 - 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.

AB - 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.

KW - CoAlN film

KW - frequency response

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KW - perpendicular magnetic anisotropy

KW - rotatable anisotropy

KW - soft magnetic film

KW - stripe domain

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

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Keywords

ASJC Scopus subject areas

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