Head with self-pinned structure having pinned layer...

Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head

Reexamination Certificate

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Reexamination Certificate

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07035059

ABSTRACT:
A magnetic head having an antiparallel (AP) pinned layer structure having at least two pinned layers with magnetic moments that are self-pinned antiparallel to each other. The pinned layers are separated by an AP coupling layer. A bias layer with a pinned magnetic moment is spaced apart from the AP pinned layer structure. A free layer is positioned between the AP pinned layer structure and the bias layer. At least one of the pinned layers extends beyond track edges of the free layer in a direction parallel to the ABS. Optional antiferromagnetic (AFM) layers can be positioned outside the track edges of the free layer in a direction parallel to the ABS (but not necessarily aligned with the free layer). The AFM layers pin a magnetic orientation of portions of the pinned layer closest thereto that are positioned outside the track edges of the free layer.

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Cho, Hae Seok, “Effect of Pinning Field on the Magnetization in Patterned Synthetic Antiferromagnetic Spin Valves,” Journal of Applied Physics, May 1, 2000, vol. 87, No. 9.

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