Magnetic sensor, production process of the magnetic sensor...

Details Magnetic sensor, production process of the magnetic sensor... Magnetic sensor, production process of the magnetic sensor...

2005-09-06

2005-09-06

Barrera, Ramon M. (Department: 2832)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C360S324110, C029S603080, C335S284000

Reexamination Certificate

active

06940701

ABSTRACT:
The present invention aims to provide a magnetic sensor provided with a magnetoresistive effect element capable of stably maintaining a direction of magnetization in a magnetic domain of a free layer.The magnetic sensor includes a magnetoresistive effect element provided with narrow zonal portions11a. . . 11aincluding a pinned layer and a free layer. Disposed below both ends of the free layer are bias magnet films11b. . . 11bcomposed of a permanent magnet that applies to the free layer a bias magnetic field in a predetermined direction and an initializing coil31that is disposed in the vicinity of the free layer and applies to the free layer a magnetic field having the direction same as that of the bias magnetic field by being energized under a predetermined condition. Further, magnetizing the bias magnet films and fixing the direction of magnetization of the pinned layer are performed by a magnetic field formed by a magnet array configured such that plural permanent magnets are arranged on a lattice point of a tetragonal lattice and a polarity of a magnet pole of each permanent magnet is different from a polarity of the other adjacent magnet pole spaced by the shortest route.

REFERENCES:
patent: 6721145 (2004-04-01), Beach
patent: 2004/0212360 (2004-10-01), Sato et al.
patent: 2000-338211 (2000-12-01), None
patent: 2002-299728 (2002-10-01), None
patent: 2004-193540 (2004-07-01), None
Copy of Honeywell catalog re Linear Magnetic Field Sensors.

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