MAGNETO-RESISTIVE EFFECT TYPE HEAD AND MAGNETIC RECORDING/REPRODUCING APPARATUS USING MAGNETO-RESISTIVE EFFECT TYPE HEAD

摘要

PURPOSE: A magneto-resistive effect type head and a magnetic recording/reproducing apparatus using the magneto-resistive effect type head are provided to obtain a GMR reproduction head of which the reproduction sensitivity is high even if the track width is narrow. CONSTITUTION: A magneto-resistive effect type head comprises a substrate; first and second magnetic shields formed on the top of the substrate; a magneto-resistive effect film formed within a gap layer between the first and second magnetic shields; a permanent magnet layer(2) provided on both sides of the magneto-resistive effect film in order to apply a magnetic field thereto; and an electrode film(4) provided on the permanent magnet layer in order to permit a signal detected current to flow. The magnetic domains of the magneto-resistive effect film are controlled by using a magnetic film. The magnetic field strength distribution in the magneto-resistive effect film due to the permanent magnet layer is strong in the edges of the track width, monotonously and abruptly decreases toward the center of the track width, and becomes uniform in the central region of the track width.