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Browse Prior Art Database

Shielded Magnetoresistive Head

IP.com Disclosure Number: IPCOM000045906D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hagopian, JJ: AUTHOR

Abstract

In a shielded magnetoresistive (MR) head, transverse magnetic bias for the MR tip of the notched central probe 1 can be produced during reading by supplying a small current in the flat coil. This bias field, made up of H1 and H2 from probe legs L1 and L2, respectively, is transverse to the length (track width) direction of the MR tip, which is made the "easy" magnetic direction at the time the head is fabricated.

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Shielded Magnetoresistive Head

In a shielded magnetoresistive (MR) head, transverse magnetic bias for the MR tip of the notched central probe 1 can be produced during reading by supplying a small current in the flat coil. This bias field, made up of H1 and H2 from probe legs L1 and L2, respectively, is transverse to the length (track width) direction of the MR tip, which is made the "easy" magnetic direction at the time the head is fabricated.

In addition, a longitudinal magnetic field component HL, parallel to the tip length so as to eliminate Barkhausen noise during reading, is provided. This is accomplished by making the two halves of the notched probe different

(1) in thickness, or

(2) in spacing from the flat coil, or

(3) in average width at upper end.

The first and third above result in reluctance differentials of the probe legs; the second and first, in net magnetomotive force differ- ential arising from shunted flux loss in the two halves. At the probe tip, a longitudinal magnetic field component develops from these differentials.

In practice, it may prove advantageous to have the difference exist in all three dimensions at the same time. This condition is illustrated in the drawing.

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