Inductive thin film head having improved readback characteristics
First Claim
Patent Images
1. A thin film magnetic recording head comprising:
- a substrate;
a magnetic yoke deposited on the substrate including structure defining a top paddle and a bottom paddle for defining a high permeability magnetic flux path, the magnetic yoke deposited upon a nonmagnetic substrate and having an axis of symmetry . ., the top and bottom paddles having negative magnetostriction.!.;
spaced apart paddle tips for the top and bottom paddles defining a magnetic flux gap in the magnetic yoke for recording and reading data proximate the flux gap, the paddle tips being normal to the axis of symmetry;
the top and bottom paddles including their respective paddle tips having a hard axis of magnetization generally parallel to the axis of symmetry and an easy axis of magnetization normal to the hard axis of magnetization in a plane of the top and bottom paddles;
a plurality of electrically insulated conductor windings, at least one of the plurality of conductor windings lying in a single plane and extending through the magnetic yoke between the top paddle and the bottom paddle; and
the conductor windings are parallel to the easy axis of . .magnetorization.!. .Iadd.magnetization .Iaddend.and perpendicular to a hard axis of magnetization of the magnetic paddles for maximizing exposure of the magnetic yoke to hard axis magnetic drive fields and minimizing exposure to easy axis magnetic drive fields whereby drive fields in the easy axis direction are less than local coercivity of the magnetic yoke.
7 Assignments
0 Petitions
Accused Products
Abstract
An inductive thin film magnetic head carried on a substrate having a reduced susceptibility to the "glitch" effect or "remote read" effect. The inductive thin film head uses a three point approach using hard axis only drive fields, narrow paddles and shortened pole tips which are spaced apart from a saw alley when the substrate is sliced.
-
Citations
12 Claims
-
1. A thin film magnetic recording head comprising:
-
a substrate; a magnetic yoke deposited on the substrate including structure defining a top paddle and a bottom paddle for defining a high permeability magnetic flux path, the magnetic yoke deposited upon a nonmagnetic substrate and having an axis of symmetry . ., the top and bottom paddles having negative magnetostriction.!.; spaced apart paddle tips for the top and bottom paddles defining a magnetic flux gap in the magnetic yoke for recording and reading data proximate the flux gap, the paddle tips being normal to the axis of symmetry; the top and bottom paddles including their respective paddle tips having a hard axis of magnetization generally parallel to the axis of symmetry and an easy axis of magnetization normal to the hard axis of magnetization in a plane of the top and bottom paddles; a plurality of electrically insulated conductor windings, at least one of the plurality of conductor windings lying in a single plane and extending through the magnetic yoke between the top paddle and the bottom paddle; and the conductor windings are parallel to the easy axis of . .magnetorization.!. .Iadd.magnetization .Iaddend.and perpendicular to a hard axis of magnetization of the magnetic paddles for maximizing exposure of the magnetic yoke to hard axis magnetic drive fields and minimizing exposure to easy axis magnetic drive fields whereby drive fields in the easy axis direction are less than local coercivity of the magnetic yoke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A thin film magnetic head recording head comprising:
-
a magnetic yoke including top and bottom poles for defining a high permeability magnetic flux path, the top and bottom poles having a hard axis of magnetization; and a flattened, generally elliptical coil laying in a single plane and extending through the magnetic yoke including a flattened portion having a plurality of substantially parallel conductors extending through the magnetic yoke and a substantially elliptical portion extending beyond the magnetic yoke wherein the plurality of substantially parallel conductors are perpendicular to the hard axis of magnetization and parallel to the easy axis for maximizing exposure of the magnetic yoke to hard axis magnetic drive fields and minimizing exposure of the magnetic yoke to easy axis magnetic drive fields whereby magnetic drive fields in an easy axis direction are less than local coercivity of the magnetic yoke.
-
-
10. A thin film magnetic head, comprising:
-
a substrate; a magnetic lower pole piece deposited over the substrate including a lower pole tip; an insulating layer deposited over the lower pole piece; a magnetic gap layer deposited over the lower pole tip; a magnetic upper pole piece deposited over the magnetic lower pole piece and including an upper pole tip deposited over the magnetic gap layer, the magnetic upper and lower pole pieces forming a magnetic flux path to the upper and lower pole tips which form a magnetic flux gap across the magnetic gap layer, the upper and lower pole pieces having a hard axis of magnetization and an easy axis of magnetization which is perpendicular to the hard axis of magnetization, and the magnetic upper and lower pole pieces have a coercivity; and a plurality of electrical conductors, at least one of the plurality of electrically conductors lying in a single plane and extending through the insulating layer and between the magnetic upper pole piece and the magnetic lower pole piece, the plurality of electrical conductors being oriented parallel with the easy axis of magnetization and perpendicular to the hard axis of magnetization of the magnetic upper and lower pole pieces for maximizing exposure of the magnetic upper and lower pole pieces to hard axis magnetic drive fields produced by the plurality of electrical conductors and minimizing exposure of the magnetic upper and lower pole pieces to easy axis magnetic drive fields produced by the plurality of electrical conductors, whereby an electrical current passed through the plurality of electrical conductors provides a magnetic field parallel to the hard axis of magnetization and perpendicular to the easy axis of magnetization of the magnetic upper and lower pole pieces so that magnetic drive fields in an easy axis direction are less than local coercivity of the pole pieces. - View Dependent Claims (11, 12)
-
Specification