Yoke structure with a step

Details Yoke structure with a step Yoke structure with a step

2006-09-05

2006-09-05

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Gap spacer

Reexamination Certificate

active

07102852

ABSTRACT:
A planar top yoke in a magnetic write head is disclosed. The top yoke includes a backside region and a second pole tip region that is thinner than the backside region and forms a step at the ABS. Alternatively, a front section of the backside region includes a step with a thickness greater than the second pole tip region. Therefore, flux is directed from a thicker backside region toward the gap side of the second pole tip layer near the ABS. A lower flux density is formed at the top of the step at the ABS which reduces the flank field/gap field ratio and prevents unwanted erasure of adjacent data tracks. A high gap field is achieved while maintaining a low flank field during high write current conditions. The step recess from the ABS toward the backside region is about 0.2 to 2 microns.

REFERENCES:
patent: 6029339 (2000-02-01), Chang et al.
patent: 6111724 (2000-08-01), Santini
patent: 6337783 (2002-01-01), Santini
patent: 6473276 (2002-10-01), Chang et al.
patent: 6504675 (2003-01-01), Shukh et al.

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