Differential GMR head using anti-parallel pinned layers

Details Differential GMR head using anti-parallel pinned layers Differential GMR head using anti-parallel pinned layers

2005-05-17

2005-05-17

Heinz, A. J. (Department: 2653)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

06894878

ABSTRACT:
A GMR read element with differential spin valves in which the free layers of the two spin valves have magnetization directions that are parallel to each other while the pinned layers most adjacent to the free layers have magnetization directions that are anti-parallel to each other. This can be achieved by having one of the spin valves be a synthetic spin valve and the other spin valve a non-synthetic spin valve. In this case, a single annealing process can set the magnetization directions of the pinned layers in this manner. It is also possible to use two synthetic spin valves in which one spin valve has an odd number of pinned layers and the other has an even number of pinned layers. The differential spin valves can be connected together in a parallel or a series relationship. It is possible for the differential sensor to be a two-, three-, or four-terminal device.

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