Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

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

doi:10.1109/TMAG.2003.808994

Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

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

^*Corresponding author for this work

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

9 Citations (Scopus)

Abstract

Recent simulations of coupled granular/continuous (CGC) perpendicular media are reviewed, and mechanisms previously shown to reduce bit transition irregularity are clarified using three-dimensional micromagnetic model that includes a simple representation of grain shape irregularity. Increasing intergranular exchange coupling is found to resolve magnetic clusters at the bit transition into smaller switching units. This is shown to reduce the amplitude and cross-track correlation length of the transition irregularity. The signal-to-noise ratio (SNR) of high-density granular media and CGC media is optimized with respect to intergranular exchange coupling. Depending on the media parameters used, the recording properties of granular and CGC media are found to differ, with CGC providing greater SNR. Preliminary experimental data are presented and found to support the results obtained from simulations.

Original language	English
Pages (from-to)	685-690
Number of pages	6
Journal	IEEE Transactions on Magnetics
Volume	39
Issue number	2 I
DOIs	https://doi.org/10.1109/TMAG.2003.808994
Publication status	Published - 2003 Mar
Externally published	Yes

Keywords

Coupled granular/continuous (CGC) media
Exchange coupling
Micromagnetic simulation
Perpendicular magnetic recording

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2003.808994

Cite this

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title = "Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media",

abstract = "Recent simulations of coupled granular/continuous (CGC) perpendicular media are reviewed, and mechanisms previously shown to reduce bit transition irregularity are clarified using three-dimensional micromagnetic model that includes a simple representation of grain shape irregularity. Increasing intergranular exchange coupling is found to resolve magnetic clusters at the bit transition into smaller switching units. This is shown to reduce the amplitude and cross-track correlation length of the transition irregularity. The signal-to-noise ratio (SNR) of high-density granular media and CGC media is optimized with respect to intergranular exchange coupling. Depending on the media parameters used, the recording properties of granular and CGC media are found to differ, with CGC providing greater SNR. Preliminary experimental data are presented and found to support the results obtained from simulations.",

keywords = "Coupled granular/continuous (CGC) media, Exchange coupling, Micromagnetic simulation, Perpendicular magnetic recording",

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

year = "2003",

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language = "English",

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journal = "IEEE Transactions on Magnetics",

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T1 - Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

AU - Goodman, A. M.

AU - Muraoka, H.

AU - Greaves, S. J.

AU - Miura, K.

AU - Sonobe, Y.

AU - Nakamura, Y.

PY - 2003/3

Y1 - 2003/3

N2 - Recent simulations of coupled granular/continuous (CGC) perpendicular media are reviewed, and mechanisms previously shown to reduce bit transition irregularity are clarified using three-dimensional micromagnetic model that includes a simple representation of grain shape irregularity. Increasing intergranular exchange coupling is found to resolve magnetic clusters at the bit transition into smaller switching units. This is shown to reduce the amplitude and cross-track correlation length of the transition irregularity. The signal-to-noise ratio (SNR) of high-density granular media and CGC media is optimized with respect to intergranular exchange coupling. Depending on the media parameters used, the recording properties of granular and CGC media are found to differ, with CGC providing greater SNR. Preliminary experimental data are presented and found to support the results obtained from simulations.

AB - Recent simulations of coupled granular/continuous (CGC) perpendicular media are reviewed, and mechanisms previously shown to reduce bit transition irregularity are clarified using three-dimensional micromagnetic model that includes a simple representation of grain shape irregularity. Increasing intergranular exchange coupling is found to resolve magnetic clusters at the bit transition into smaller switching units. This is shown to reduce the amplitude and cross-track correlation length of the transition irregularity. The signal-to-noise ratio (SNR) of high-density granular media and CGC media is optimized with respect to intergranular exchange coupling. Depending on the media parameters used, the recording properties of granular and CGC media are found to differ, with CGC providing greater SNR. Preliminary experimental data are presented and found to support the results obtained from simulations.

KW - Coupled granular/continuous (CGC) media

KW - Exchange coupling

KW - Micromagnetic simulation

KW - Perpendicular magnetic recording

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Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

Abstract

Keywords

ASJC Scopus subject areas

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