High Ku and low intergranular exchange coupling of postannealed CoPt-WO3 granular film

Kim Kong Tham; Shintaro Hinata; Shin Saito; Migaku Takahashi

doi:10.1109/TMAG.2014.2321025

High K_u and low intergranular exchange coupling of postannealed CoPt-WO₃ granular film

Kim Kong Tham, Shintaro Hinata, Shin Saito, Migaku Takahashi

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

4 Citations (Scopus)

Abstract

Magnetic properties and microstructure of Co₈₀Pt₂₀-30 vol.% (Al₂O₃, TiO₂, WO₃) and Co_82.4Pt_17.6-27.7 vol.% SiO₂ granular films postannealed at various temperatures in a heat-treating furnace were investigated. In this paper, it is found that among these granular films, CoPt-WO₃ granular film shows the highest coercivity (H_c) because of low intergranular exchange coupling of well-isolated magnetic grains. Furthermore, the H_c is enhanced with postannealing because of the increase of the magnetic anisotropy field (H_k^grain) and uniaxial magnetocrystalline anisotropy (K_u^grain) of the columnar growth magnetic grains. The increase of K_u^grain for the postannealed granular film primarily originates from the reduction of the stacking faults as well as the lattice constant ratio.

Original language	English
Article number	6971658
Journal	IEEE Transactions on Magnetics
Volume	50
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2014.2321025
Publication status	Published - 2014 Nov 1

Keywords

CoPt-WO granular film
high K
perpendicular magnetic recording
postannealing

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2014.2321025

Cite this

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title = "High Ku and low intergranular exchange coupling of postannealed CoPt-WO3 granular film",

abstract = "Magnetic properties and microstructure of Co80Pt20-30 vol.% (Al2O3, TiO2, WO3) and Co82.4Pt17.6-27.7 vol.% SiO2 granular films postannealed at various temperatures in a heat-treating furnace were investigated. In this paper, it is found that among these granular films, CoPt-WO3 granular film shows the highest coercivity (Hc) because of low intergranular exchange coupling of well-isolated magnetic grains. Furthermore, the Hc is enhanced with postannealing because of the increase of the magnetic anisotropy field (Hkgrain) and uniaxial magnetocrystalline anisotropy (Kugrain) of the columnar growth magnetic grains. The increase of Kugrain for the postannealed granular film primarily originates from the reduction of the stacking faults as well as the lattice constant ratio.",

keywords = "CoPt-WO granular film, high K, perpendicular magnetic recording, postannealing",

author = "Tham, {Kim Kong} and Shintaro Hinata and Shin Saito and Migaku Takahashi",

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AU - Tham, Kim Kong

AU - Hinata, Shintaro

AU - Saito, Shin

AU - Takahashi, Migaku

PY - 2014/11/1

Y1 - 2014/11/1

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AB - Magnetic properties and microstructure of Co80Pt20-30 vol.% (Al2O3, TiO2, WO3) and Co82.4Pt17.6-27.7 vol.% SiO2 granular films postannealed at various temperatures in a heat-treating furnace were investigated. In this paper, it is found that among these granular films, CoPt-WO3 granular film shows the highest coercivity (Hc) because of low intergranular exchange coupling of well-isolated magnetic grains. Furthermore, the Hc is enhanced with postannealing because of the increase of the magnetic anisotropy field (Hkgrain) and uniaxial magnetocrystalline anisotropy (Kugrain) of the columnar growth magnetic grains. The increase of Kugrain for the postannealed granular film primarily originates from the reduction of the stacking faults as well as the lattice constant ratio.

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