Magnetic read-write head shield that prevents flux...

Details Magnetic read-write head shield that prevents flux... Magnetic read-write head shield that prevents flux...

2005-04-28

2009-10-06

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S125300

Reexamination Certificate

active

07599152

ABSTRACT:
In a read-write head, the shields can serve as magnetic flux conductors for external fields, so that they direct a certain amount of flux into the recording medium. This problem has been overcome by the addition to the shields of a pair of tabs located at the edges closest to the ABS. These tabs serve to prevent flux concentrating at the edges so that horizontal fields at these edges are significantly reduced. Said tabs need to have aspect ratios of at least 2 and may be either triangular or rectangular in shape. Alternatively, the tabs may be omitted and, instead, outer portions of the shield's lower edge may be shaped so as to slope upwards away from the ABS.

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Co-pending U.S. Appl. No. 11/117,672, filed Apr. 28, 2004, “Modified Shield Shape for a Perpendicular Recording Head to Reduce Sensitivity to External Fields,” assigned to the same assignee.

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