Magnetoresistive head with spin valve film magnetic sensor...

Details Magnetoresistive head with spin valve film magnetic sensor... Magnetoresistive head with spin valve film magnetic sensor...

2005-11-29

2005-11-29

Heinz, A. J. (Department: 2653)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

06970332

ABSTRACT:
An improvement in the corrosion resistance of a magnetoresistive head is aimed for, and a high magnetoresistivity ratio is maintained. In a magnetoresistive head equipped with, as a magnetic sensor element for detecting magnetic signals while in contact with a magnetic recording medium, a spin-valve film, which has a structure where an anti-ferromagnetic layer, a pinned layer in which the direction of magnetization is pinned in a predetermined direction by an exchange-coupling magnetic field at work between itself and the anti-ferromagnetic layer, a free layer in which the direction of magnetization changes in accordance with an external magnetic field, and a non-magnetic layer for magnetically isolating the pinned layer and the free layer are layered, the corrosion potential of the spin-valve film relative to a standard hydrogen electrode measured while immersed in a NaCl solution of a concentration of 0.1 mol/L is specified at +0.4 [V vs. SHE] or above.

REFERENCES:
patent: 5742458 (1998-04-01), Koike et al.
patent: 5766743 (1998-06-01), Fujikata et al.
patent: 6764778 (2004-07-01), Saito et al.

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