Influence of magnetic cluster-size distribution on signal-to-noise ratio in perpendicular magnetic recording media

M. Hashimoto; K. Miura; H. Muraoka; H. Aoi; Y. Nakamura

doi:10.1109/TMAG.2004.830468

Influence of magnetic cluster-size distribution on signal-to-noise ratio in perpendicular magnetic recording media

M. Hashimoto, K. Miura, H. Muraoka, H. Aoi, Y. Nakamura

Broadband Engineering Division

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

7 Citations (Scopus)

Abstract

Perpendicular recording media noise is investigated with a microstructure model based upon magnetic clustering for irregular magnetization transitions. This model uses cylinders to account for the distribution of cluster diameters. Quantitative comparisons between experiments and calculations indicate that the cluster-size distribution of media can be estimated from the read/write properties. Estimates show that the cluster-size deviation of perpendicular recording media is somewhat larger than that of longitudinal recording media. Because calculations show that transition jitter depends strongly on the cluster-size distribution, reduction of the cluster-size deviation, as well as reducing the average cluster size, can significantly improve the signal-to-noise ratio of perpendicular recording media.

Original language	English
Pages (from-to)	2458-2460
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	40
Issue number	4 II
DOIs	https://doi.org/10.1109/TMAG.2004.830468
Publication status	Published - 2004 Jul 1

Keywords

Media noise
Partial erasure
Percolation
Perpendicular double-layer media
Single pole head

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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AU - Muraoka, H.

AU - Aoi, H.

AU - Nakamura, Y.

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N2 - Perpendicular recording media noise is investigated with a microstructure model based upon magnetic clustering for irregular magnetization transitions. This model uses cylinders to account for the distribution of cluster diameters. Quantitative comparisons between experiments and calculations indicate that the cluster-size distribution of media can be estimated from the read/write properties. Estimates show that the cluster-size deviation of perpendicular recording media is somewhat larger than that of longitudinal recording media. Because calculations show that transition jitter depends strongly on the cluster-size distribution, reduction of the cluster-size deviation, as well as reducing the average cluster size, can significantly improve the signal-to-noise ratio of perpendicular recording media.

AB - Perpendicular recording media noise is investigated with a microstructure model based upon magnetic clustering for irregular magnetization transitions. This model uses cylinders to account for the distribution of cluster diameters. Quantitative comparisons between experiments and calculations indicate that the cluster-size distribution of media can be estimated from the read/write properties. Estimates show that the cluster-size deviation of perpendicular recording media is somewhat larger than that of longitudinal recording media. Because calculations show that transition jitter depends strongly on the cluster-size distribution, reduction of the cluster-size deviation, as well as reducing the average cluster size, can significantly improve the signal-to-noise ratio of perpendicular recording media.

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