High Ku and small grain size Co80Pt20 granular media with double oxide grain boundary materials consisting of B2O3

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

doi:10.1063/1.4977768

High K_u and small grain size Co₈₀Pt₂₀ granular media with double oxide grain boundary materials consisting of B₂O₃

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

ENG - Electronic Engineering

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

10 Citations (Scopus)

Abstract

Investigation of magnetic properties and microstructure of granular media with various double oxides including B₂O₃ as the grain boundary material is reported. By adding a high T_m second oxide together with B₂O₃ for the grain boundary material, comparable magnetic properties with that of the single oxide granular media and smaller crystallite size evaluated by X-ray diffraction (GD_inplane) than that of the single oxide granular media can be obtained. Among the evaluated media, the granular medium with B₂O₃− TiO₂ is promising for the grain boundary material, showing comparable average M_s and K_u of 806 emu/cm³ and 7.7×10⁶ erg/cm³ with that of the single B₂O₃ and smaller GD_inplane of 4.8 nm than that of the single B₂O₃ of 5.4 nm. In the TEM image, thin grain boundaries inside the grains can be observed which indicates that small grains with one-on-one grains growth is expected when an underlayer with smaller grain size is utilized.

Original language	English
Article number	056512
Journal	AIP Advances
Volume	7
Issue number	5
DOIs	https://doi.org/10.1063/1.4977768
Publication status	Published - 2017 May 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "High Ku and small grain size Co80Pt20 granular media with double oxide grain boundary materials consisting of B2O3",

abstract = "Investigation of magnetic properties and microstructure of granular media with various double oxides including B2O3 as the grain boundary material is reported. By adding a high Tm second oxide together with B2O3 for the grain boundary material, comparable magnetic properties with that of the single oxide granular media and smaller crystallite size evaluated by X-ray diffraction (GDinplane) than that of the single oxide granular media can be obtained. Among the evaluated media, the granular medium with B2O3− TiO2 is promising for the grain boundary material, showing comparable average Ms and Ku of 806 emu/cm3 and 7.7×106 erg/cm3 with that of the single B2O3 and smaller GDinplane of 4.8 nm than that of the single B2O3 of 5.4 nm. In the TEM image, thin grain boundaries inside the grains can be observed which indicates that small grains with one-on-one grains growth is expected when an underlayer with smaller grain size is utilized.",

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AU - Kushibiki, Ryosuke

AU - Tham, Kim Kong

AU - Hinata, Shintaro

AU - Saito, Shin

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Investigation of magnetic properties and microstructure of granular media with various double oxides including B2O3 as the grain boundary material is reported. By adding a high Tm second oxide together with B2O3 for the grain boundary material, comparable magnetic properties with that of the single oxide granular media and smaller crystallite size evaluated by X-ray diffraction (GDinplane) than that of the single oxide granular media can be obtained. Among the evaluated media, the granular medium with B2O3− TiO2 is promising for the grain boundary material, showing comparable average Ms and Ku of 806 emu/cm3 and 7.7×106 erg/cm3 with that of the single B2O3 and smaller GDinplane of 4.8 nm than that of the single B2O3 of 5.4 nm. In the TEM image, thin grain boundaries inside the grains can be observed which indicates that small grains with one-on-one grains growth is expected when an underlayer with smaller grain size is utilized.

AB - Investigation of magnetic properties and microstructure of granular media with various double oxides including B2O3 as the grain boundary material is reported. By adding a high Tm second oxide together with B2O3 for the grain boundary material, comparable magnetic properties with that of the single oxide granular media and smaller crystallite size evaluated by X-ray diffraction (GDinplane) than that of the single oxide granular media can be obtained. Among the evaluated media, the granular medium with B2O3− TiO2 is promising for the grain boundary material, showing comparable average Ms and Ku of 806 emu/cm3 and 7.7×106 erg/cm3 with that of the single B2O3 and smaller GDinplane of 4.8 nm than that of the single B2O3 of 5.4 nm. In the TEM image, thin grain boundaries inside the grains can be observed which indicates that small grains with one-on-one grains growth is expected when an underlayer with smaller grain size is utilized.

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High K_u and small grain size Co₈₀Pt₂₀ granular media with double oxide grain boundary materials consisting of B₂O₃

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