Analysis on magnetization transition of CGC perpendicular media

H. Muraoka; Y. Sonobe; K. Miura; A. M. Goodman; Y. Nakamura

doi:10.1109/TMAG.2002.1017747

Analysis on magnetization transition of CGC perpendicular media

H. Muraoka^*, Y. Sonobe, K. Miura, A. M. Goodman, Y. Nakamura

^*Corresponding author for this work

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

25 Citations (Scopus)

Abstract

Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction.

Original language	English
Pages (from-to)	1632-1636
Number of pages	5
Journal	IEEE Transactions on Magnetics
Volume	38
Issue number	4 I
DOIs	https://doi.org/10.1109/TMAG.2002.1017747
Publication status	Published - 2002 Jul
Externally published	Yes

Keywords

CGC media
Media noise
Perpendicular magnetic recording
Thermal stability
Transition jitter

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2002.1017747

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title = "Analysis on magnetization transition of CGC perpendicular media",

abstract = "Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction.",

keywords = "CGC media, Media noise, Perpendicular magnetic recording, Thermal stability, Transition jitter",

author = "H. Muraoka and Y. Sonobe and K. Miura and Goodman, {A. M.} and Y. Nakamura",

note = "Funding Information: Manuscript received November 19, 2001; revised February 21, 2002. This work was supported in part by the Japanese Society of the Promotion of Science under the Program of “Research for the Future” and in part by the Storage Research Consortium.",

year = "2002",

month = jul,

doi = "10.1109/TMAG.2002.1017747",

language = "English",

volume = "38",

pages = "1632--1636",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "4 I",

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TY - JOUR

T1 - Analysis on magnetization transition of CGC perpendicular media

AU - Muraoka, H.

AU - Sonobe, Y.

AU - Miura, K.

AU - Goodman, A. M.

AU - Nakamura, Y.

N1 - Funding Information: Manuscript received November 19, 2001; revised February 21, 2002. This work was supported in part by the Japanese Society of the Promotion of Science under the Program of “Research for the Future” and in part by the Storage Research Consortium.

PY - 2002/7

Y1 - 2002/7

N2 - Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction.

AB - Modeling and read/write characteristics of coupled granular/continuous (CGC) perpendicular recording media are described. The media consists of a continuous layer with a strong in-plain exchange coupling and a granular layer with magnetically isolated grain structure. The two layers are coupled by interlayer exchange coupling. Hysteresis loop squareness approaching unity is realized in CGC samples with only a 3-6 nm continuous layer on a CoCrPt granular layer. An approximated energy calculation shows a domain-wall pinning effect and transition smoothing due to interlayer exchange coupling between the two layers. Read/write measurements for the CGC media indicate signal-to-noise ratio improvement in association with transition jitter reduction, which suggests transition smoothing. Thermal stability is improved by interlayer exchange interaction.

KW - CGC media

KW - Media noise

KW - Perpendicular magnetic recording

KW - Thermal stability

KW - Transition jitter

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DO - 10.1109/TMAG.2002.1017747

M3 - Article

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EP - 1636

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 4 I

ER -

Analysis on magnetization transition of CGC perpendicular media

Abstract

Keywords

ASJC Scopus subject areas

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