Layered return poles for magnetic write heads

Details Layered return poles for magnetic write heads Layered return poles for magnetic write heads

2011-04-26

2011-04-26

Cao, Allen T (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

Reexamination Certificate

active

07933096

ABSTRACT:
Methods and structures for the fabrication of both thin film longitudinal and perpendicular write heads are disclosed. A unique feature of these write heads is the inclusion of layered return poles, which comprise alternating layers of 22/78 and 80/20 NiFe alloys. The alternating layers also vary in thickness, the 22/78 NiFe layers having a nominal thickness of 1500 angstroms and the 80/20 NiFe layers having a nominal thickness of about 75 angstroms. Head efficiency and signal to noise ratios are significantly improved in heads having layered return pole construction.

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patent: 2003/0048582 (2003-03-01), Kanada et al.
patent: 2010/0214692 (2010-08-01), Kief et al.
patent: 2010/0302681 (2010-12-01), Mino et al.

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