Proposal of Granular-Type Cap Layer with High-Ku CoPt Grains and Ferromagnetic Oxide Grain Boundaries for Full Granular Media

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

doi:10.1109/TMAG.2019.2893257

Proposal of Granular-Type Cap Layer with High-K_u CoPt Grains and Ferromagnetic Oxide Grain Boundaries for Full Granular Media

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

ENG - Electronic Engineering

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

1 Citation (Scopus)

Abstract

Investigation of magnetic properties and microstructure for the stacked media with Co₈₀Pt₂₀-30 vol% rare earth (RE) oxide (RE oxide: Gd₂O₃, Nd₂O₃, and Sm₂O₃) cap layers (CLs) deposited on a Co₈₀Pt₂₀-30 vol% B₂O₃ granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B₂O₃ GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd₂O₃ (9 nm), is deposited on CoPt-B₂O₃ GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.

Original language	English
Article number	8640849
Journal	IEEE Transactions on Magnetics
Volume	55
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2019.2893257
Publication status	Published - 2019 Jul

Keywords

CoPt-BO
ferromagnetic oxide
full granular media
granular cap layer (CL)
high K
rare earth (RE) oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2019.2893257

Cite this

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title = "Proposal of Granular-Type Cap Layer with High-Ku CoPt Grains and Ferromagnetic Oxide Grain Boundaries for Full Granular Media",

abstract = "Investigation of magnetic properties and microstructure for the stacked media with Co80Pt20-30 vol% rare earth (RE) oxide (RE oxide: Gd2O3, Nd2O3, and Sm2O3) cap layers (CLs) deposited on a Co80Pt20-30 vol% B2O3 granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B2O3 GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd2O3 (9 nm), is deposited on CoPt-B2O3 GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.",

keywords = "CoPt-BO, ferromagnetic oxide, full granular media, granular cap layer (CL), high K, rare earth (RE) oxide",

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

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AU - Tham, Kim Kong

AU - Kushibiki, Ryosuke

AU - Kamada, Tomonari

AU - Saito, Shin

PY - 2019/7

Y1 - 2019/7

N2 - Investigation of magnetic properties and microstructure for the stacked media with Co80Pt20-30 vol% rare earth (RE) oxide (RE oxide: Gd2O3, Nd2O3, and Sm2O3) cap layers (CLs) deposited on a Co80Pt20-30 vol% B2O3 granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B2O3 GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd2O3 (9 nm), is deposited on CoPt-B2O3 GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.

AB - Investigation of magnetic properties and microstructure for the stacked media with Co80Pt20-30 vol% rare earth (RE) oxide (RE oxide: Gd2O3, Nd2O3, and Sm2O3) cap layers (CLs) deposited on a Co80Pt20-30 vol% B2O3 granular recording layer (GRL) was conducted. It was found that the employment of a granular-type CL with ferromagnetic oxide is effective to control intergranular exchange coupling of the magnetic grains in CoPt-B2O3 GRL while maintaining the granular structure of the CL. In this full granular media, continuous structure of columnar magnetic grains and grain boundaries from the GRL up to the CL can be observed. When a typical ferromagnetic oxide CL, such as CoPt-Gd2O3 (9 nm), is deposited on CoPt-B2O3 GRL (16 nm), the nucleation field is increased from 0.7 to 1.1 kOe, and the saturation field is reduced from 21.5 to 16 kOe which suggest that CoPt-RE oxide is promising for a CL.

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KW - high K

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