Thin-film magnetic head in which perpendicular magnetic...

Details Thin-film magnetic head in which perpendicular magnetic... Thin-film magnetic head in which perpendicular magnetic...

2007-02-20

2010-10-26

Evans, Jefferson (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S319000, C360S125160, C360S125200

Reexamination Certificate

active

07821745

ABSTRACT:
A thin-film magnetic head is provided. The thin-film magnetic head includes a return-yoke layer formed on an opposed surface such that a maximum length of the return-yoke layer is shorter than a longer length of the length of the upper shield layer and the lower shield layer. The length sets in the range of 0 to 2 μm, and more preferably 2 μm. Accordingly, magnitudes of leakage magnetic fields leaked from each front end surface of return-yoke layer, the upper shield layer, and the lower shield layer toward the record medium are balanced and reduced. An advantage of the invention is to provide a thin-film magnetic head so as to prevent a record data recorded in a record medium from being erased.

REFERENCES:
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patent: 2003/0223149 (2003-12-01), Kimura et al.
patent: 2005/0141142 (2005-06-01), Mochizuki et al.
patent: 2006/0082924 (2006-04-01), Etoh et al.
patent: 2006/0132972 (2006-06-01), Tagami et al.
patent: 2006/0203381 (2006-09-01), Okada et al.
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patent: 2002-190515 (2005-07-01), None
patent: 2006-99891 (2006-04-01), None
patent: 2006-18558 (2006-07-01), None

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