Magneto-resistive reading head with reduced side-lobe
AssigneeYamaha Corporation
InventorsShigeru Shouji, Atsushi Toyoda
Life of this patent
Estimating the term…
Abstract
A thin film magnetic head made of material having the magneto-resistance (MR) effect and its manufacturing method are provided. A lower shield layer for magnetically shielding an MR film is formed with a trench of a gull-wing shape having a flat bottom surface and opposite slanted surfaces formed on both sides of the bottom surface. The MR film is formed on the lower shield layer conformal to the gull-wing shape. The region of the MR film on the flat bottom surface forms an effective magnetic active region. A track center shift and the generation of a side-lobe in the off-track characteristic specific to an MR head can be suppressed and high density recording and reproducing of narrow tracks are possible.
Claims11
A magneto-resistance type head which is divided into an active region for detecting a magnetic field and inactive regions not contributing to the detection of the magnetic field, the magnetic-resistance type head comprising:
- a base and a magnetic shield formed on the base, said magnetic shield having upper flat portions, slanted surfaces provided between the upper flat portions, and a lower flat portion provided between the slanted surfaces so as to define a recess, the magnetic shield comprising a lower magnetic shield sub-layer and an upper magnetic shield sub-layer formed on the lower magnetic shield sub-layer, and said recess being formed in the upper magnetic shield sub-layer;
- a magneto-resistance material layer conformally formed over the magnetic shield;
- a first spacer layer formed in the inactive regions and on the lower magnetic shield sub-layer;
- a longitudinal bias means formed on the first spacer layer;
- and
- a second spacer layer formed on the longitudinal bias means.
Dependencies are inferred from the claim text.