Magnetic write head having a hybrid material main pole for high frequency recording
AssigneeHGST Netherlands B.V.
InventorsMikito Sugiyama, Hiromi Shiina, Kazue Kudo, Yusuke Takahashi, Kimitoshi Eto
Life of this patent
Estimating the term…
Abstract
Approaches for a magnetic write head having a hybrid material main pole, in which a first magnetic material has a first cross-sectional area (A1) and a second magnetic material has a second cross-sectional area (A2), and wherein the ratio A1/A2 reduces in a direction away from the air bearing surface. The first material comprises a high saturation magnetic flux density material, and the second material comprises a high magnetic permeability and low saturation magnetic flux density material having a lower saturation magnetic flux density than said first material.
Claims20
A perpendicular magnetic recording write head comprising:
- a write pole extending to an air bearing surface, said write pole comprising a main pole comprising a yoke from which a pole tip protrudes at a neck point, and said main pole comprising a first material having a first cross-sectional area (A1) and a second material having a second cross-sectional area (A2);
- a magnetic return pole, magnetically connected with said write pole in a region removed from said air bearing surface;
- a write coil arranged around said write pole so as to induce a magnetic flux in said write pole when electrical current flows through said write coil;
- and wherein the ratio A1/A2 reduces in a direction away from said air bearing surface.
A hard disk drive, comprising:
- a head slider comprising a magnetic write head;
- a magnetic-recording disk rotatably mounted on a spindle;
- a voice coil motor configured to move the head slider to access portions of the magnetic-recording disk;
- and
- wherein said magnetic write head comprises:
- a write pole extending to an air bearing surface, said write pole comprising a main pole comprising a yoke from which a pole tip protrudes at a neck point, and said main pole comprising a first material having a first cross-sectional area (A1) and a second material having a second cross-sectional area (A2);
- a magnetic return pole, magnetically connected with said write pole in a region removed from said air bearing surface;
- a write coil arranged around said write pole so as to induce a magnetic flux in said write pole when electrical current flows through said write coil;
- and wherein the ratio A1/A2 reduces in a direction away from said air bearing surface.
Dependencies are inferred from the claim text.