Magnetic sensing device with multilayered pinned magnetic...

Details Magnetic sensing device with multilayered pinned magnetic... Magnetic sensing device with multilayered pinned magnetic...

2007-09-11

2007-09-11

Castro, Angel (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

11156678

ABSTRACT:
A magnetic sensing device is presented that has a multilayer material with a pinned magnetic layer, a nonmagnetic material layer, and a free magnetic layer. The pinned magnetic layer is a composite with a nonmagnetic intermediate layer and magnetic thin-film layers separated from each other by the nonmagnetic intermediate layer. A first nonmagnetic magnetostriction-enhancing layer is on the pinned magnetic layer and contacts a first thin-film layer placed farthest from the nonmagnetic material layer. At least one of the magnetic thin-film layers has a composite structure with a second nonmagnetic magnetostriction-enhancing layer and magnetic layers separated from each other by the second magnetostriction-enhancing layer. All of the magnetic layers are magnetized in the same direction antiparallel to the adjacent magnetic thin-film layer. At least some crystals of the first and second magnetostriction-enhancing layers and the first thin-film layer/magnetic layers are epitaxial or heteroepitaxial.

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