Magnetic recording apparatus with correlated main magnetic...

Details Magnetic recording apparatus with correlated main magnetic... Magnetic recording apparatus with correlated main magnetic...

2011-04-05

2011-04-05

Davis, David D (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

Reexamination Certificate

active

07920359

ABSTRACT:
Embodiments of the present invention achieve a high linear recording density and a high track recording density to thereby improve the areal recording density in a perpendicular magnetic recording apparatus having a magnetic head that includes a trailing shield and side shields around a main magnetic pole piece. According to one embodiment, in a magnetic recording apparatus, each of magnetic distances of various sorts is set so as to satisfy relationships of Lmag<T-Gap and HUS<S-Gap, where the magnetic shortest distance between the main magnetic pole piece and a trailing shield is defined as T-Gap; the magnetic shortest distance between the main magnetic pole piece and each of side shields disposed on both sides of the main magnetic pole piece is defined as S-Gap; a distance between a surface of the main magnetic pole piece and a lower surface of a magnetic recording layer constituting a recording medium is defined as Lmag; and a distance between the surface of the main magnetic pole piece and an upper surface of a soft magnetic underlayer of the recording medium is defined as HUS. Further, each of the magnetic distances of various sorts is set so as to satisfy a relationship of Lmag<T-Gap<HUS<S-Gap.

REFERENCES:
patent: 2004/0212923 (2004-10-01), Taguchi
patent: 2005/0141137 (2005-06-01), Okada et al.
patent: 2005/0237665 (2005-10-01), Guan et al.
patent: 2006/0082924 (2006-04-01), Etoh et al.
patent: 2008/0117546 (2008-05-01), Le et al.
patent: 2008/0180839 (2008-07-01), Mochizuki et al.

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