Magnetic head and magnetic disk storage apparatus mounting the head

Abstract

Embodiments in accordance with the present invention provide a magnetic head in which broadening of the effective track width can be decreased without reducing the write-field intensity and a variation of the track width can be decreased. A main pole consists of a pole tip having a part which provides the write track-width and a yoke part recessed from the air beating surface in the element height direction, and the pole tip consists of a pole tip at the trailing side where the width in the track-width direction is large and a pole tip at the leading side where the width in the track width direction is small. Moreover, the throat height of the pole tip at the trailing side is made greater than the throat height of the pole tip at the leading side.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1( a)-(b) are conceptual drawings illustrating a magnetic storage disk apparatus.

FIG. 2 is a cross-sectional schematic drawing illustrating an example of a magnetic head in accordance with an embodiment of the present invention at the track center.

FIG. 3 is a plane schematic drawing illustrating an example of a magnetic head in accordance with an embodiment of the present invention as seen from the trailing direction.

FIG. 4 is a schematic perspective drawing illustrating an example of a pole tip of a magnetic head in accordance with an embodiment of the present invention.

FIG. 5 is a cross-sectional schematic drawing at the track center illustrating another example of a magnetic head in accordance with an embodiment of the present invention.

FIG. 6 is a schematic perspective drawing illustrating a pole tip of a conventional magnetic head structure.

FIG. 7 is a comparison of the write-field distribution in the track-width direction between a magnetic head of the present invention and a conventional magnetic head.

FIG. 8 is a drawing illustrating contour lines of the write-field of a conventional magnetic head.

FIG. 9 is a drawing illustrating contour lines of the write-field of a magnetic head in accordance with an embodiment of the present invention.

FIG. 10 is a schematic drawing illustrating a pole tip as seen from the air bearing surface.

FIG. 11 is a relationship between the write-field intensity and the write-field distribution width using the air bearing surface shape of the pole tip at the trailing side as a parameter.

FIG. 12 is a plane schematic drawing illustrating another example of a magnetic head in accordance with an embodiment of the present invention as seen from the trailing direction.

FIG. 13 is a plane schematic drawing illustrating another example of a magnetic head in accordance with an embodiment of the present invention as seen from the trailing direction.

FIG. 14 is a schematic perspective drawing illustrating an example of a pole tip of a magnetic head in accordance with an embodiment of the present invention.

FIG. 15 is a plane schematic drawing illustrating another example of a magnetic head in accordance with an embodiment of the present invention as seen from the trailing direction.

FIG. 16 are drawings illustrating an example of a manufacturing method of a magnetic head in accordance with an embodiment of the present invention.

FIG. 17 is a drawing illustrating an example of a manufacturing method of a magnetic head in accordance with an embodiment of the present invention.

FIGS. 18( a)-(b) are drawings illustrating an example of a manufacturing method of a magnetic head in accordance with an embodiment of the present invention.

Claims

1. A magnetic head for a perpendicular recording comprising a main pole and an auxiliary pole, wherein said main pole has a pole tip providing a write track-width and a yoke part recessed from said pole tip in the element-height direction; andsaid pole tip has two magnetic films having different widths in the track-width direction; the width in the track-width direction at an air bearing surface of the magnetic film at the trailing side is greater than the width in the track-width direction at an air bearing surface of the magnetic film at the leading side; and a throat height of the magnetic film at said trailing side is greater than a throat height of the magnetic film at said leading side.

2. A magnetic head according to claim 1, wherein the width in the track-width direction at the air bearing surface of the magnetic film at said trailing side is greater than the film thickness at said trailing side in the downtrack direction.

3. A magnetic head according to claim 1, wherein the difference of the widths of the part where the magnetic film at said trailing side and the magnetic film of said leading side are connected to each other at the air bearing surface is greater than the film thickness in the downtrack direction of the magnetic film at said trailing direction.

4. A magnetic head according to claim 1, wherein the shape of the air bearing surface of the magnetic film at said trailing side and/or the magnetic film at said leading side is a reverse-trapezoid.

5. A magnetic head according to claim 1, wherein the magnetic film at said leading side is recessed from the air bearing surface.

6. A magnetic head according to claim 1, wherein a flare angle of a squeeze point of the magnetic film at said trailing side is smaller than a flare angle of a squeeze point of the magnetic film at said leading side.

7. A magnetic disk storage apparatus comprising: a recording medium;a medium driving part driving said recording medium;a magnetic head which has a write head and a read head and performs write and read to said recording medium; anda head driving part positioning said magnetic head relative to said recording medium, whereinsaid recording medium is a perpendicular recording medium having a soft under layer and a recording layer,said write head has a main pole and an auxiliary pole,said main pole has a pole tip providing a write track-width and a yoke part recessed from said pole tip in the element-height direction, andsaid pole tip has two magnetic films having different widths in the track-width direction; the width in the track-width direction at an air bearing surface of the magnetic film at the trailing side is greater than the width in the track-width direction at an air bearing surface of the magnetic film at the leading side; and a throat height of the magnetic film at said trailing side is greater than a throat height of the magnetic film at said leading side.

8. A magnetic disk storage apparatus according to claim 7, wherein a flare angle of a squeeze point of the magnetic film at said trailing side is smaller than a flare angle of a squeeze point of the magnetic film at said leading side.