Fe content dependence of synthetic-antiferromagnetic coupling in subnano-crystalline FeCoB/Ru/FeCoB films

Atsushi Hashimoto; Shin Saito; Migaku Takahashi

doi:10.1109/TMAG.2006.879432

Fe content dependence of synthetic-antiferromagnetic coupling in subnano-crystalline FeCoB/Ru/FeCoB films

Atsushi Hashimoto, Shin Saito, Migaku Takahashi

ENG - Electronic Engineering

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

10 Citations (Scopus)

Abstract

Ru thickness (d_Ru) dependence of flopping field (H_f) was investigated in subnano-crystalline (Co_100-xFe_x)₈₈B₁₂/Ru/(Co_100-xFe_x)₈₈B₁₂ films with various Fe content, x. The H_f with d_Ru showed oscillatory behavior with the period of 1.5 nm of d_Ru, which was independent of the Fe content. The first peak of H_f takes the maximum value at x = 65 at.%, and the second peak was degenerated with increasing the Fe content. These results are analyzed in terms of interlayer coupling effect including the bilinear (J₁) and biquadratic (J₂) coupling energy. As the d_Ru decreases, the J₁ oscillates and J₂ monotonously increases. Although the J₂ effect appeared at thinner d_Ru, i.e., d_Ru <0.7 nm, the J₁effect was rather stronger than the J₂ one. The magnitude of the first peak of J₁was greatly enhanced with increasing Fe content, and took the maximum at x = 65 at.%. Therefore, a smooth interface was established in subnano-crystalline FeCoB, and the intrinsic strong J₁was realized in FeCoB/Ru/FeCoB system even in ultrathin d_Ru of 0.3 nm.

Original language	English
Pages (from-to)	2342-2344
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	42
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2006.879432
Publication status	Published - 2006 Oct

Keywords

Interlayer coupling
perpendicular recording medium
soft magnetic underlayer
subnano-crystalline FeCoB

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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@article{c573b5315b654630b33114991a1962f0,

title = "Fe content dependence of synthetic-antiferromagnetic coupling in subnano-crystalline FeCoB/Ru/FeCoB films",

abstract = "Ru thickness (dRu) dependence of flopping field (Hf) was investigated in subnano-crystalline (Co100-xFex)88B12/Ru/(Co100-xFex)88B12 films with various Fe content, x. The Hf with dRu showed oscillatory behavior with the period of 1.5 nm of dRu, which was independent of the Fe content. The first peak of Hf takes the maximum value at x = 65 at.%, and the second peak was degenerated with increasing the Fe content. These results are analyzed in terms of interlayer coupling effect including the bilinear (J1) and biquadratic (J2) coupling energy. As the dRu decreases, the J1 oscillates and J2 monotonously increases. Although the J2 effect appeared at thinner dRu, i.e., dRu <0.7 nm, the J1effect was rather stronger than the J2 one. The magnitude of the first peak of J1was greatly enhanced with increasing Fe content, and took the maximum at x = 65 at.%. Therefore, a smooth interface was established in subnano-crystalline FeCoB, and the intrinsic strong J1was realized in FeCoB/Ru/FeCoB system even in ultrathin dRu of 0.3 nm.",

keywords = "Interlayer coupling, perpendicular recording medium, soft magnetic underlayer, subnano-crystalline FeCoB",

author = "Atsushi Hashimoto and Shin Saito and Migaku Takahashi",

year = "2006",

month = oct,

doi = "10.1109/TMAG.2006.879432",

language = "English",

volume = "42",

pages = "2342--2344",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "10",

}

TY - JOUR

T1 - Fe content dependence of synthetic-antiferromagnetic coupling in subnano-crystalline FeCoB/Ru/FeCoB films

AU - Hashimoto, Atsushi

AU - Saito, Shin

AU - Takahashi, Migaku

PY - 2006/10

Y1 - 2006/10

N2 - Ru thickness (dRu) dependence of flopping field (Hf) was investigated in subnano-crystalline (Co100-xFex)88B12/Ru/(Co100-xFex)88B12 films with various Fe content, x. The Hf with dRu showed oscillatory behavior with the period of 1.5 nm of dRu, which was independent of the Fe content. The first peak of Hf takes the maximum value at x = 65 at.%, and the second peak was degenerated with increasing the Fe content. These results are analyzed in terms of interlayer coupling effect including the bilinear (J1) and biquadratic (J2) coupling energy. As the dRu decreases, the J1 oscillates and J2 monotonously increases. Although the J2 effect appeared at thinner dRu, i.e., dRu <0.7 nm, the J1effect was rather stronger than the J2 one. The magnitude of the first peak of J1was greatly enhanced with increasing Fe content, and took the maximum at x = 65 at.%. Therefore, a smooth interface was established in subnano-crystalline FeCoB, and the intrinsic strong J1was realized in FeCoB/Ru/FeCoB system even in ultrathin dRu of 0.3 nm.

AB - Ru thickness (dRu) dependence of flopping field (Hf) was investigated in subnano-crystalline (Co100-xFex)88B12/Ru/(Co100-xFex)88B12 films with various Fe content, x. The Hf with dRu showed oscillatory behavior with the period of 1.5 nm of dRu, which was independent of the Fe content. The first peak of Hf takes the maximum value at x = 65 at.%, and the second peak was degenerated with increasing the Fe content. These results are analyzed in terms of interlayer coupling effect including the bilinear (J1) and biquadratic (J2) coupling energy. As the dRu decreases, the J1 oscillates and J2 monotonously increases. Although the J2 effect appeared at thinner dRu, i.e., dRu <0.7 nm, the J1effect was rather stronger than the J2 one. The magnitude of the first peak of J1was greatly enhanced with increasing Fe content, and took the maximum at x = 65 at.%. Therefore, a smooth interface was established in subnano-crystalline FeCoB, and the intrinsic strong J1was realized in FeCoB/Ru/FeCoB system even in ultrathin dRu of 0.3 nm.

KW - Interlayer coupling

KW - perpendicular recording medium

KW - soft magnetic underlayer

KW - subnano-crystalline FeCoB

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