High SN ratio and signal-stability in triple layer perpendicular media

Nishihara, Toshikazu; Ando, Toshio

doi:10.3379/jmsjmag.21.s1_104

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Issues For Double-layer Perpendicular Recording1

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1997

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“…Undeclayer noise in double-layer media is another concern, and may cause fatal errors because of its spike-like nature. It was reported that wall pinning by exchange coupling is effective in reducing this noise [15].…”

Section: Issues For Double-layer Perpendicular Recordingmentioning

confidence: 99%

Quantification of Perpendicular Magnetic Recording with Double Layer Media

Muraoka

Nakamura

1997

J. Magn. Soc. Jpn.

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A quantitative calculation of the readback performance of shielded MR heads is performed for high density perpendicular magnetic recording, and compared with that from longitudinal recording. An analytical expression of the head field of the MR head with doule layer media is given to be used in a reciprocity calculation. Conditions to achieve a half-height pulse width, PW so' of 115 nm and 70 nm are presented. With these results and SNR estimations, issues of the read/write system to obtain areal densities of 20 Gbpsi and higher are discussed.

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Section: Issues For Double-layer Perpendicular Recordingmentioning

confidence: 99%