Magnetic Write Head Having A Recessed High Moment Portion Of The Wrap-Around Shield
AssigneeHGST Netherlands B.V.
InventorVenkatesh Chembrolu
Life of this patent
Estimating the term…
Abstract
Approaches to improving hard disk drive far track interference problems include utilizing a wrap-around shield having recessed high magnetic moment layer(s). Embodiments include tapering the high-moment portion away from the air bearing surface (ABS) in the cross-track direction away from the write pole, thereby reducing exposure of high moment layers at the ABS to reduce the risk of unwanted track erasure away from the main pole. Embodiments include positioning the high magnetic moment layers in their entirety away from the ABS, such as with a laminate structure of high magnetic moment and low magnetic moment materials laid down in a direction away from the pole tip trailing edge.
Claims20
A magnetic write head comprising:
- a magnetic write pole extending to an air bearing surface;
- and
- a wrap-around shield wrapping around a portion of said write pole, said wrap-around shield comprising:
- a high-moment portion having at least a portion recessed from said air bearing surface, and
- a low-moment portion having at least a portion flush with said air bearing surface.
A magnetic write head comprising:
- a magnetic write pole extending to an air bearing surface;
- and
- a wrap-around shield wrapping around a portion of said write pole, comprising;
- a high-moment portion recessed from said air bearing surface, and
- a low-moment portion having at least a portion flush with said air bearing surface.
A hard disk drive, comprising:
- a head slider comprising a magnetic write head, said write head comprising:
- a magnetic write pole extending to an air bearing surface, and
- a wrap-around shield wrapping around a portion of said write pole, said wrap-around shield comprising:
- a high-moment portion having at least a portion recessed from said air bearing surface, and
- a low-moment portion having at least a portion flush with said air bearing surface;
- a magnetic-recording disk rotatably mounted on a spindle;
- and
- a voice coil motor configured to move the head slider to access portions of the magnetic-recording disk.
Dependencies are inferred from the claim text.