Write head with second coil above pole having coil density less

Details Write head with second coil above pole having coil density less Write head with second coil above pole having coil density less

1997-09-05

1999-02-23

Renner, Craig A.

Dynamic magnetic information storage or retrieval

Head

Coil

2960324, G11B 517

Patent

active

058750800

ABSTRACT:
A low inductance magnetic write head is provided with first and second pole piece layers that have first ends separated by a write gap layer and second ends connected together at a back gap. An insulation stack is provided which is sandwiched between the first and second pole piece layers. A write coil layer and a second coil layer are provided wherein each coil layer has inner and outer ends. The coil layers wind in the same direction from their inner ends to their outer ends. Each of the coil layers has first and second layer portions. The first layer portion of the write coil layer is embedded in the insulation stack. The second pole piece layer is sandwiched between the first portion of the write coil and a non-magnetic layer and the first non-magnetic layer is sandwiched between the second pole piece layer and the first portion of the second coil layer. The inner ends of the coil layers are electrically connected and the outer ends of the coil layers are electrically connected to a write current source so that when the write current source is introduced write fluxes from the coil layers are in opposition. The first layer portion of the second coil layer has a turn density that is less than a turn density of the first layer portion of the write coil layer.

REFERENCES:
patent: 4652956 (1987-03-01), Schewe
patent: 4672493 (1987-06-01), Schewe
patent: 4694368 (1987-09-01), Bischoff et al.
patent: 4713711 (1987-12-01), Jones, Jr et al.
patent: 4899434 (1990-02-01), Roberts
patent: 5075956 (1991-12-01), Das
patent: 5170302 (1992-12-01), Matsumoto
patent: 5173826 (1992-12-01), Bischoff
patent: 5241440 (1993-08-01), Ashida et al.
patent: 5331495 (1994-07-01), Yoshida et al.
patent: 5406695 (1995-04-01), Amemori
patent: 5461528 (1995-10-01), Keel
patent: 5471354 (1995-11-01), Bortins et al.

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