Multiple element transducer for magnetic recording

Details Multiple element transducer for magnetic recording Multiple element transducer for magnetic recording

1997-04-03

2000-08-15

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 75, 360316, G11B 1512

Patent

active

061045624

ABSTRACT:
In a rotating magnetic disk storage device which uses an imbedded servo pattern for positioning an actuator, each transducer head comprises two magnetoresistive read elements, the read elements being separated by an insulating layer. The read elements are of different widths, the narrower element being used to read data, and the wider element being used to read servo patterns which locate the track centerline. The read elements are preferably deposited in layers on the rear of the slider body, with a thin-film inductive write head deposited in layers over the read elements. Preferably, the read elements are connected to three lead wires: a common ground lead, and separate sense leads. The sense amplification electronics alternatively sense resistance changes in one element or the other as the head passes over data or servo patterns. Because the narrow read element is used for reading data, noise due to reading too close to the edge of the track can be reduced. Because the wide element is used for reading the track centerline servo pattern, the full pattern width can be read and the transducer positioned more accurately.

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