Perpendicular recording head with floating-trailing shield...

Details Perpendicular recording head with floating-trailing shield... Perpendicular recording head with floating-trailing shield...

2007-02-20

2008-10-21

Renner, Craig A (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125030, C360S128000

Reexamination Certificate

active

07440230

ABSTRACT:
Heads for perpendicular recording using a floating-trailing shield are described. The floating-trailing shield is separated from the main pole piece by a layer of non-magnetic material along its entire length and the air bearing surface of the floating-trailing shield is substantially larger than that of the main pole piece. The reluctance between the trailing shield and the underlayer in the recording medium is made so low that both are at the same magnetomotive force (or potential), so that no direct connection is needed between the floating-trailing shield and the yoke. When the head is used in a storage system with a magnetic recording medium with a soft underlayer, the floating-trailing shield is, in effect, magnetically shorted to the return pole piece during recording. In one embodiment the floating-trailing shield wraps around the sides of the main pole piece.

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M Mallory et al. “One Terabit per Square Inch Perpendicular Recording Conceptual Design,” IEEE Transactions on Magnetics, vol. 38, No. 4, Jul. 2002, pp. 1719-1724.

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