MR read transducer with thermal noise cancellation

Details MR read transducer with thermal noise cancellation MR read transducer with thermal noise cancellation

1994-04-15

1995-05-30

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Hall effect

G11B 5127

Patent

active

054207363

ABSTRACT:
Three leads L1, L2, and L3 connected to an MR stripe of an MR read transducer are arranged in a circuit for eliminating: (1) thermal asperity noise, (2) damage from shorting from the transducer to a magnetic medium, and (3) signal reduction from shorting between the conductive layers of the transducer at the ABS. The first and second leads L1 and L2 are connected to the MR stripe adjacent its top edge and the third lead L3 is connected to the MR stripe adjacent its bottom edge, the bottom edge being at the ABS of the transducer. A current of equal magnitude is applied to each of the first and second leads to flow at an angle from each of these leads to the third lead L3, this angle being preferably 45.degree. to the longitudinal axis or ABS of the MR stripe. A differential preamplifier is connected across the first and second leads L1 and L2. With this arrangement, thermal asperity noise is cancelled by common mode rejection at the differential preamplifier. The third lead L3 and the support device for a magnetic medium are grounded to prevent sensor damage from shorting between these components. The third lead also electrically interconnects the MR stripe to one of the shield layers S1 or S2 and both shield layers are grounded to prevent signal loss from shorting between these conductive layers at the ABS.

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The Barber Pole, A Linear Magnetoresistive Head, K. E. Kuijk, W. J. van Gestel and F. W. Gorter, IEEE Transactions on Magnetics, vol. Mag-11, No. 5, Sep., 1975, pp. 1215-1217.
The Design of Magnetoresistive Multitrack READ Heads for Magnetic Tapes, Werner Metzdorf, M. Boehner and H. Haudek, IEEE Transactions on Magnetics, vol. Mag-18, No. 2, Mar., 1982, pp. 763-768.

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