Planar thin film magnetic head

A planar thin film magnetic head comprising:

• a base;
• a back thin film magnetic yoke provided on said base;
• an MR element provided above said back thin film magnetic yoke;
• a thin film magnetic yoke magnetically connected to opposite ends of said MR element and having a magnetic gap;
• a bias conductor arranged near said gap and aligned transverse to the gap length of said magnetic gap for applying a bias magnetic field to said MR element;
• and
• a first conductor layer extending in the gap length direction of said magnetic gap so as to cross said magnetic gap.

A thin film magnetic head comprising a thin film magnetic core having a magnetic gap substantially parallel to a magnetic recording medium;

• said thin film magnetic core comprising a pair of magnetic members having opposed end surfaces between which said magnetic gap is defined, said opposed end surfaces having a width defining a track width;
• said magnetic members being gradually widened as they come away from said magnetic gap so that a divergent angle .theta. of first opposite side edges of said magnetic members from a direction of a gap length of said magnetic gap is set to the range of 30.degree..ltoreq..theta..ltoreq.80.degree.;
• and
• said magnetic members having second opposite side edges extending in substantially parallel to the direction of the gap length of said magnetic gap.

A magnetic head in the form of a planar type thin film comprising:

• a substrate;
• a thin film magnetic core supported on said substrate and comprising a first upper yoke, a second upper yoke, and a lower yoke;
• a magnetic gap formed between said first upper yoke and said second upper yoke;
• an MR element provided between said upper yoke and said lower yoke;
• a bias conductor for applying a bias magnetic field to said MR element provided between said upper yoke and said lower yoke;
• said first upper yoke and said second upper yoke being gradually widened as they come away from said magnetic gap so that a divergent angle .theta. of first opposite side edges of said upper yokes from the direction of the gap length of said magnetic gap is set to the range of 30.degree..ltoreq..theta..ltoreq.80.degree.;
• and
• said upper yokes having second opposite side edges extending in substantially parallel to the direction of the gap length of said magnetic gap.