Thin film magnetic head having a bias magnetic layer...

Details Thin film magnetic head having a bias magnetic layer... Thin film magnetic head having a bias magnetic layer...

2011-01-11

2011-01-11

Evans, Jefferson (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S324120

Reexamination Certificate

active

07869166

ABSTRACT:
A thin film magnetic head has: a spin valve having a pinned layer whose having a fixed magnetization direction, a first nonmagnetic intermediate layer disposed on the pinned layer, and a free layer having a variable magnetization direction, the free layer disposed on the first nonmagnetic intermediate layer; and bias magnetic layers for applying a bias magnetic field to the free layer provided on both sides of the spin valve. The pinned layer has a hard magnetic layer, a second nonmagnetic intermediate layer disposed on the hard magnetic layer, and a ferromagnetic layer disposed on the second nonmagnetic intermediate layer. The bias magnetic layer has a bias antiferromagnetic layer, and a bias ferromagnetic layer disposed on the bias antiferromagnetic layer. A height direction dimension of the pinned layer is longer than a track width direction dimension, and longer than a height direction dimension of the free layer.

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