Thin film magnetic head, thin film magnetic head device, and magnetic recording/reproducing apparatus
View Patent ↗A thin-film magnetic head includes a slider substrate and a write element. The slider substrate has an air bearing surface at one side thereof. The write element has a recording magnetic pole film. The recording magnetic pole film is disposed on a plane crossing the air bearing surface over the slider substrate and has a large-width portion and a small-width portion continuously arranged in the named order toward the air bearing surface. The small-width portion has a smaller width than the large-width portion. Of the large-width portion and the small-width portion, at least the small-width portion has a first portion and a second portion. The second portion is continuous with an upper end of the first portion and has both side faces inclined in such a direction as to increase the width. An external angle of the first portion formed by a plane parallel to a bottom face and the side face is larger than an external angle of the second portion formed by a plane parallel to the bottom face and the side face.
1. A thin-film magnetic head comprising a slider substrate and a write element,
the slider substrate having an air bearing surface at one side thereof,
the write element having a recording magnetic pole film,
the recording magnetic pole film being disposed on a plane crossing the air bearing surface over the slider substrate and having a large-width portion and a small-width portion continuously arranged in the named order toward the air bearing surface, the air bearing surface being parallel to an XZ plane of an XYZ orthogonal coordinate system with an X axis direction being a track width direction, wherein
the small-width portion
has a smaller width than the large-width portion, the width being measured in the X axis direction, and
has a second small-width portion whose width in the X axis direction gradually decreases along a Y axis direction of the XYZ orthogonal coordinate system from a boundary with the large-width portion and a first small-width portion continuous with the second small-width portion along the Y axis direction,
the second small-width portion has a first portion and a second portion,
the first portion extends in a Z axis direction of the XYZ orthogonal coordinate system,
the second portion is continuous with an upper end of the first portion and has both side faces inclined in such a direction as to increase a width of the second portion in the X axis direction toward an upper end of the second portion, the upper end of the first portion and the upper end of the second portion located in the Z axis direction opposite to a direction in which the slider substrate is located,
an external angle of the first portion formed by a plane parallel to a bottom face of the first portion and a side face of the first portion is larger than an external angle of the second portion formed by a plane parallel to a bottom face of the second portion and a side face among the both side faces of the second portion, the side face of the first portion and the side face of the second portion extending in the Y axis direction, the bottom face of the first portion located in an opposite direction in which the upper end of the first portion is located, and the bottom face of the second portion located in an opposite direction in which the upper end of the second portion is located, and
an end face of the first small-width portion at the air bearing surface side has a triangle shape.
2. The thin-film magnetic head of claim 1 , wherein the first portion extends in the Z axis direction with a constant width in the X axis direction.
3. The thin-film magnetic head of claim 1 , wherein width of the first small-width portion in the X axis direction is constant.
4. The thin-film magnetic head of claim 1 , wherein a bottom face of the first small-width portion is located at an upper location as compared to a bottom face of the second small-width portion in the Z axis direction.
5. The thin-film magnetic head of claim 1 , wherein the recording magnetic pole film produces a perpendicular recording magnetic field.
6. The thin-film magnetic head of claim 1 , further comprising a reproducing element, the reproducing element being disposed at the slider substrate.
7. The thin-film magnetic head of claim 6 , wherein the reproducing element includes a GMR element or a TMR element.
8. A thin-film magnetic head device comprising a thin-film magnetic head and a head support device, wherein
the thin-film magnetic head is that claimed in claim 1 , and
the head support device supports the thin-film magnetic head.
9. The thin-film magnetic head device of claim 8 , wherein the first portion extends in the Z axis direction upward with a constant width in the X axis direction.
10. A magnetic recording/reproducing apparatus comprising a thin-film magnetic head device and a magnetic recording medium, wherein
the thin-film magnetic head device is that claimed in claim 8 , and
the magnetic recording/reproducing apparatus performs magnetic recording and reproducing in association with the magnetic recording medium.