Reduction of intergranular exchange coupling for CoPt-B2O3 granular media by employing a rucocr-oxide buffer layer with oxide of various melting points

Kim Kong Tham; Ryosuke Kushibiki; Tomonari Kamada; Shintaro Hinata; Shin Saito

doi:10.1109/TMAG.2018.2835559

Reduction of intergranular exchange coupling for CoPt-B₂O₃ granular media by employing a rucocr-oxide buffer layer with oxide of various melting points

Kim Kong Tham, Ryosuke Kushibiki, Tomonari Kamada, Shintaro Hinata, Shin Saito

ENG - Electronic Engineering

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

Abstract

Investigation of magnetic properties and microstructure for the Co₈₀Pt₂₀-30vol% B₂O₃ granular medium deposited on Ru₅₀Co₂₅Cr₂₅-30vol% oxide buffer layer (BL) with oxide of various melting points was conducted. It was found that by employing a BL, coercivity of the granular medium is enhanced due to the promotion of intergranular exchange decoupling. Thickness of the BL to obtain the maximum coercivity can be reduced when oxides with high melting point is utilized. Significant reduction of grain diameter (GD) of the granular medium is obtained when a thick BL with high-melting point oxide is applied. For a typical Ru₅₀Co₂₅Cr₂₅-30vol% TiO₂ BL of 2 nm, a granular medium with high coercivity, anisotropy field, and small magnetic GD of 9.4, 19.5 kOe, and 5.6 nm, respectively, can be achieved.

Original language	English
Article number	8379351
Journal	IEEE Transactions on Magnetics
Volume	54
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2018.2835559
Publication status	Published - 2018 Nov

Keywords

CoPt-BO granular media
RuCoCr-oxide buffer layer (BL)
intergranular exchange coupling
oxide melting point

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2018.2835559

Cite this

@article{201d427288be487db5c62f3094c8eb84,

title = "Reduction of intergranular exchange coupling for CoPt-B2O3 granular media by employing a rucocr-oxide buffer layer with oxide of various melting points",

abstract = "Investigation of magnetic properties and microstructure for the Co80Pt20-30vol% B2O3 granular medium deposited on Ru50Co25Cr25-30vol% oxide buffer layer (BL) with oxide of various melting points was conducted. It was found that by employing a BL, coercivity of the granular medium is enhanced due to the promotion of intergranular exchange decoupling. Thickness of the BL to obtain the maximum coercivity can be reduced when oxides with high melting point is utilized. Significant reduction of grain diameter (GD) of the granular medium is obtained when a thick BL with high-melting point oxide is applied. For a typical Ru50Co25Cr25-30vol% TiO2 BL of 2 nm, a granular medium with high coercivity, anisotropy field, and small magnetic GD of 9.4, 19.5 kOe, and 5.6 nm, respectively, can be achieved.",

keywords = "CoPt-BO granular media, RuCoCr-oxide buffer layer (BL), intergranular exchange coupling, oxide melting point",

author = "Tham, {Kim Kong} and Ryosuke Kushibiki and Tomonari Kamada and Shintaro Hinata and Shin Saito",

note = "Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

year = "2018",

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language = "English",

volume = "54",

journal = "IEEE Transactions on Magnetics",

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T1 - Reduction of intergranular exchange coupling for CoPt-B2O3 granular media by employing a rucocr-oxide buffer layer with oxide of various melting points

AU - Tham, Kim Kong

AU - Kushibiki, Ryosuke

AU - Kamada, Tomonari

AU - Hinata, Shintaro

AU - Saito, Shin

PY - 2018/11

Y1 - 2018/11

N2 - Investigation of magnetic properties and microstructure for the Co80Pt20-30vol% B2O3 granular medium deposited on Ru50Co25Cr25-30vol% oxide buffer layer (BL) with oxide of various melting points was conducted. It was found that by employing a BL, coercivity of the granular medium is enhanced due to the promotion of intergranular exchange decoupling. Thickness of the BL to obtain the maximum coercivity can be reduced when oxides with high melting point is utilized. Significant reduction of grain diameter (GD) of the granular medium is obtained when a thick BL with high-melting point oxide is applied. For a typical Ru50Co25Cr25-30vol% TiO2 BL of 2 nm, a granular medium with high coercivity, anisotropy field, and small magnetic GD of 9.4, 19.5 kOe, and 5.6 nm, respectively, can be achieved.

AB - Investigation of magnetic properties and microstructure for the Co80Pt20-30vol% B2O3 granular medium deposited on Ru50Co25Cr25-30vol% oxide buffer layer (BL) with oxide of various melting points was conducted. It was found that by employing a BL, coercivity of the granular medium is enhanced due to the promotion of intergranular exchange decoupling. Thickness of the BL to obtain the maximum coercivity can be reduced when oxides with high melting point is utilized. Significant reduction of grain diameter (GD) of the granular medium is obtained when a thick BL with high-melting point oxide is applied. For a typical Ru50Co25Cr25-30vol% TiO2 BL of 2 nm, a granular medium with high coercivity, anisotropy field, and small magnetic GD of 9.4, 19.5 kOe, and 5.6 nm, respectively, can be achieved.

KW - CoPt-BO granular media

KW - RuCoCr-oxide buffer layer (BL)

KW - intergranular exchange coupling

KW - oxide melting point

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