MAGNETIC SENSOR, PRODUCTION PROCESS OF THE MAGNETIC SENSOR, AND MAGNETIC ARRAY SUITABLE FOR THE PRODUCTION PROCESS

摘要

The present invention is to provide a magnetic sensor having a magnetoresistive element that can maintain the direction of magnetization of the magnetic domain of the free layer in a stable manner. The magnetic sensor includes a pinned layer (pinned layer) and the upper narrow-band width (width of the narrow strip-like portion) that includes a free layer (11a ... 11a), a magnetoresistive element having. Both ends of the bottom of the pre-layer film biasing magnet made of a permanent magnet for generating a bias magnetic field in a predetermined direction on the same free layer (11b ... 11b) with the free-up the layer to be formed wherein the bias magnetic field by the energized under predetermined conditions, and the initializing coil 31 for applying a magnetic field in the same direction in the free layer is formed. In addition, the bias magnetic film magnetized (着 磁) and fixed in the direction of the magnetization of the pinned layer is different to the polarity of the magnetic pole of each permanent magnet with a box arranged a plurality of permanent magnets on the lattice points of the tetragonal lattice contiguous with the shortest distance It achieved by a magnetic field formed by the magnet array configured to match the polarity of the magnetic pole. ; A permanent magnet, the initialization coil, a wafer, a magnet array