Magnetic heads for perpendicular recording with trapezoidal pole tips
AssigneeWestern Digital (Fremont), LLC
InventorsYingjian Chen, Yugang Wang, Francis Liu, Xizeng Shi, Kyusik Sin, Hugh Craig Hiner
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Abstract
Electromagnetic transducers are disclosed having write poles with a leading edge that is smaller than a trailing edge, which can reduce erroneous writing for perpendicular recording systems. The write poles may have a trapezoidal shape when viewed from a direction of an associated medium. The write poles may be incorporated in heads or sliders that also contain read elements such as magnetoresistive sensors, and may be employed with information storage systems such as disk drives.
Claims25
A magnetic head for recording information on a relatively-moving medium, the head having a leading end, a trailing end, and a medium-facing surface, the head comprising:
- a first soft magnetic layer extending a first distance substantially perpendicular to the medium-facing surface and terminating at a first pole tip disposed adjacent to said medium-facing surface, said first pole tip having a leading edge and a trailing edge, wherein said trailing edge is substantially larger than said leading edge;
- a second soft magnetic layer extending substantially perpendicular to the medium-facing surface and terminating at a second pole tip disposed adjacent to said medium-facing surface, said second pole tip having a medium-facing area that is substantially larger than that of said first pole tip;
- and
- a third soft magnetic layer extending a second distance substantially perpendicular to the medium-facing surface, adjoining said first soft magnetic layer and terminating further than said first pole tip from said medium-facing surface, wherein said second distance is more than half said first distance.
A magnetic head for recording information on a spinning disk, the head having a leading end, a trailing end, and a disk-facing surface, the head comprising:
- a first soft magnetic layer disposed in said head and terminating at a first pole tip disposed adjacent to said disk-facing surface,
- a second soft magnetic layer disposed in said head and terminating at a second pole tip disposed adjacent to said disk-facing surface, said second pole tip having a leading edge and a trailing edge, wherein said leading edge is disposed further than said trailing edge from said leading end and said trailing edge is substantially larger than said leading edge;
- an electrically conductive coil section disposed between said first and second soft magnetic layers;
- and
- a third soft magnetic layer adjoining said second soft magnetic layer, said third soft magnetic layer terminating further than said second pole tip from said disk-facing surface, said third soft magnetic layer terminating closer than said coil section to said disk-facing surface.
An information storage system comprising:
- a rigid disk spinning about a disk center, said disk having a media layer adjacent to a disk surface, the media layer having an easy axis of magnetization that is substantially perpendicular to the disk surface;
- an arm having a free end adjacent to said disk surface, said arm adapted to move said end toward and away from said disk center;
- a head coupled to said free end, said head having a leading end, a trailing end, and a disk-facing surface, said disk-facing surface disposed adjacent to said disk surface;
- a first soft magnetic layer disposed in said head and terminating in a first pole tip disposed adjacent to said disk-facing surface;
- a second soft magnetic layer disposed in said head and terminating in a second pole tip disposed adjacent to said disk-facing surface, said second pole tip having a leading edge and a trailing edge, wherein said trailing edge is disposed closer than said leading edge to the trailing end and said trailing edge is substantially larger than said leading edge;
- an electrically conductive coil section disposed between said first and second soft magnetic layers;
- and
- a third soft magnetic layer adjoining said second soft magnetic layer, said third soft magnetic layer terminating further than said second pole tip from said disk-facing surface, said third soft magnetic layer terminating closer than said coil section to said disk-facing surface.
Dependencies are inferred from the claim text.