Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2007-02-27
2007-02-27
Korzuch, William (Department: 2653)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C360S324110, C029S603070, C029S603140, C029S603150
Reexamination Certificate
active
11264543
ABSTRACT:
A patterned, synthetic, longitudinally exchange biased GMR sensor is provided which has a narrow effective trackwidth and reduced side reading. The advantageous properties of the sensor are obtained by satisfying a novel relationship between the magnetizations (M) of the ferromagnetic free layer (F1) and the ferromagnetic biasing layer (F2) which enables the optimal thicknesses of those layers to be determined for a wide range of ferromagnetic materials and exchange coupling materials. The relationship to be satisfied is MF2/MF1=(Js+Jex)/Js, where Jsis the synthetic coupling energy between F1 and F2 and Jexis the exchange energy between F2 and an overlaying antiferromagnetic pinning layer. An alternative embodiment omits the overlaying antiferromagnetic pinning layer which causes the relationship to become MF2/MF1=1.
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Co-pending U.S. Patent HT-01-020, U.S. Appl. No. 10/116,984, Filed Apr. 05, 2002, “Patterned Exchange Bias GMR Using Metallic Buffer Layer”, assigned to the same assignee.
Co-pending U.S. Patent HT-01-032, U.S. Appl. No. 10/091,959, Filed Mar. 6, 2002, “Easily Manufactured Exchange Bias Stabilization Scheme”, assigned to the same assignee.
Ju Kochan
Li Min
Liao Simon
Zheng You Feng
Ackerman Stephen B.
Headway Technologies Inc.
Korzuch William
Magee Christopher R.
Saile Ackerman LLC
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