Patent ID: 8009392
Filing Date: 2011-08-30
Classification: G01R,G11B

Abstract:
1. A thin film magnetic head comprising: a magneto-resistive (MR) effect element comprising: bias magnetic field application layers formed at junction tapered parts formed on both end parts of the MR effect film in a width direction via insulating layers and foundation layers, wherein the free layer is configured to change its magnetization direction in accordance with an external magnetic field, a magnetization direction of the magnetic pinned layer is pinned, and the bias magnetic field application layers are configured to apply a vertical bias magnetic field to the free layer, the foundation layers are disposed between the insulating layers and the bias magnetic field application layers, and are configured of Cr or Cr alloy, and the insulating layers are configured of a Si oxide such that the Si content of the Si oxide is in the range of 30˜56 at % (atom %) and that the atom ratio of oxygen to Si (O/Si) is in the range of 0.8˜1.3.