Observation of magnetization distribution in soft underlayer of perpendicular magnetic recording media by electron holography

Kei Hirata; Keiichi Yanagisawa; Yoichi Ishida; Hiroto Kasai; Katsuaki Yanagiuchi; Daisuke Shindo; Akira Tonomura

doi:10.1109/TMAG.2010.2040596

Observation of magnetization distribution in soft underlayer of perpendicular magnetic recording media by electron holography

Kei Hirata, Keiichi Yanagisawa, Yoichi Ishida, Hiroto Kasai, Katsuaki Yanagiuchi, Daisuke Shindo, Akira Tonomura

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

1 Citation (Scopus)

Abstract

The magnetic properties of the soft underlayer (SUL) of perpendicular recording media affect the recording performance significantly. We visualized and quantified the distribution and magnitude of magnetic flux in the recording layer and SULs of perpendicular recording media by electron holography. Pseudo-SULs with different permeability were deposited on the slider of perpendicular recording heads. The SUL with higher permeability produced higher write magnetic flux (B_y as compared to the SUL with lower permeability, which results higher overwrite performance. Further, the magnitude profile of B_x in the SUL thickness direction was different for the two SULs; the magnitude of magnetic flux in SUL is related to the occurrence of adjacent track erasure.

Original language	English
Article number	5467556
Pages (from-to)	2290-2292
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	46
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2010.2040596
Publication status	Published - 2010 Jun

Keywords

Electron holography
Perpendicular magnetic recording media
Perpendicular magnetic recording system
Soft underlayer

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2010.2040596

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Observation of magnetization distribution in soft underlayer of perpendicular magnetic recording media by electron holography. / Hirata, Kei; Yanagisawa, Keiichi; Ishida, Yoichi; Kasai, Hiroto; Yanagiuchi, Katsuaki; Shindo, Daisuke; Tonomura, Akira.

In: IEEE Transactions on Magnetics, Vol. 46, No. 6, 5467556, 06.2010, p. 2290-2292.

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

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abstract = "The magnetic properties of the soft underlayer (SUL) of perpendicular recording media affect the recording performance significantly. We visualized and quantified the distribution and magnitude of magnetic flux in the recording layer and SULs of perpendicular recording media by electron holography. Pseudo-SULs with different permeability were deposited on the slider of perpendicular recording heads. The SUL with higher permeability produced higher write magnetic flux (By as compared to the SUL with lower permeability, which results higher overwrite performance. Further, the magnitude profile of Bx in the SUL thickness direction was different for the two SULs; the magnitude of magnetic flux in SUL is related to the occurrence of adjacent track erasure.",

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AU - Hirata, Kei

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AU - Shindo, Daisuke

AU - Tonomura, Akira

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Observation of magnetization distribution in soft underlayer of perpendicular magnetic recording media by electron holography

Abstract

Keywords

ASJC Scopus subject areas

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