Magnetic properties and nanostructure of FePt-TiN granular films deposited with N2 gas addition for heat assisted magnetic recording media

Kim Kong Tham; Ryosuke Kushibiki; Shin Saito

doi:10.35848/1347-4065/ac931c

Magnetic properties and nanostructure of FePt-TiN granular films deposited with N₂ gas addition for heat assisted magnetic recording media

Kim Kong Tham, Ryosuke Kushibiki, Shin Saito

ENG - Electronic Engineering

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

Abstract

Magnetic properties and nanostructure for FePt-30vol%TiN deposited while flowing N₂ gas are investigated. When N₂ gas addition of 3%-5% are introduced, compared with that of without N₂ gas, reduction in the lattice constant ratio and the unit cell volume, the increase in the degree of order of the granular film are observed. These indicate the segregation of Ti into grain boundaries as the result of the N₂ gas addition through nitridization of Ti dissolved in the FePt grains which lead to the enhancement of saturation magnetization, perpendicular magnetic anisotropy, and magnetic anisotropy field of the granular film. Therefore, magnetic decoupling in the FePt-TiN similar to the FePt-BN granular films is promoted by the segregation of nitrides formed by nitridization of metal element solidly soluble in FePt magnetic grains due to nitrogen deficiency.

Original language	English
Article number	SB1011
Journal	Japanese journal of applied physics
Volume	62
Issue number	SB
DOIs	https://doi.org/10.35848/1347-4065/ac931c
Publication status	Published - 2023 Mar 1

Keywords

FePt-BN
FePt-TiN
L1 typed FePt
N2 gas
granular film
heat assisted magnetic recording
nitridization

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

Access to Document

10.35848/1347-4065/ac931c

Cite this

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title = "Magnetic properties and nanostructure of FePt-TiN granular films deposited with N2 gas addition for heat assisted magnetic recording media",

abstract = "Magnetic properties and nanostructure for FePt-30vol%TiN deposited while flowing N2 gas are investigated. When N2 gas addition of 3%-5% are introduced, compared with that of without N2 gas, reduction in the lattice constant ratio and the unit cell volume, the increase in the degree of order of the granular film are observed. These indicate the segregation of Ti into grain boundaries as the result of the N2 gas addition through nitridization of Ti dissolved in the FePt grains which lead to the enhancement of saturation magnetization, perpendicular magnetic anisotropy, and magnetic anisotropy field of the granular film. Therefore, magnetic decoupling in the FePt-TiN similar to the FePt-BN granular films is promoted by the segregation of nitrides formed by nitridization of metal element solidly soluble in FePt magnetic grains due to nitrogen deficiency.",

keywords = "FePt-BN, FePt-TiN, L1 typed FePt, N2 gas, granular film, heat assisted magnetic recording, nitridization",

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

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T1 - Magnetic properties and nanostructure of FePt-TiN granular films deposited with N2 gas addition for heat assisted magnetic recording media

AU - Tham, Kim Kong

AU - Kushibiki, Ryosuke

AU - Saito, Shin

PY - 2023/3/1

Y1 - 2023/3/1

N2 - Magnetic properties and nanostructure for FePt-30vol%TiN deposited while flowing N2 gas are investigated. When N2 gas addition of 3%-5% are introduced, compared with that of without N2 gas, reduction in the lattice constant ratio and the unit cell volume, the increase in the degree of order of the granular film are observed. These indicate the segregation of Ti into grain boundaries as the result of the N2 gas addition through nitridization of Ti dissolved in the FePt grains which lead to the enhancement of saturation magnetization, perpendicular magnetic anisotropy, and magnetic anisotropy field of the granular film. Therefore, magnetic decoupling in the FePt-TiN similar to the FePt-BN granular films is promoted by the segregation of nitrides formed by nitridization of metal element solidly soluble in FePt magnetic grains due to nitrogen deficiency.

AB - Magnetic properties and nanostructure for FePt-30vol%TiN deposited while flowing N2 gas are investigated. When N2 gas addition of 3%-5% are introduced, compared with that of without N2 gas, reduction in the lattice constant ratio and the unit cell volume, the increase in the degree of order of the granular film are observed. These indicate the segregation of Ti into grain boundaries as the result of the N2 gas addition through nitridization of Ti dissolved in the FePt grains which lead to the enhancement of saturation magnetization, perpendicular magnetic anisotropy, and magnetic anisotropy field of the granular film. Therefore, magnetic decoupling in the FePt-TiN similar to the FePt-BN granular films is promoted by the segregation of nitrides formed by nitridization of metal element solidly soluble in FePt magnetic grains due to nitrogen deficiency.

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KW - FePt-TiN

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