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US 11,894,028 B2Granted
Magnetic recording head with trailing shield having multiple throat-heights
AssigneeWestern Digital Technologies, Inc.
InventorsQuan-Chiu Harry Lam, Mark H. Burkhardt, El-Amine Salhi
Life of this patent
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Abstract
The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole and a trailing shield disposed adjacent to the main pole. A recessed edge of the trailing shield has throat heights varying in the cross-track direction. In one embodiment, the central portion of the trailing shield has a first throat height greater than a second throat height of outer portions of the trailing shield. The trailing shield having varying throat heights in the cross-track direction strengthens the writing capability or improves the XTI of the magnetic recording head.
Claims20
A magnetic recording head, comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface;
- and
- at least one outer portion disposed adjacent to the central portion, the at least one outer portion having a second throat height defined between a second surface of the recessed edge and the media facing surface, wherein the second throat height is less than the first throat height such that the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the at least one outer portion.
5 more elements
A magnetic recording device comprising a magnetic recording head, the magnetic recording head comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface;
- and
- at least one outer portion disposed adjacent to the central portion, the at least one outer portion having a second throat height defined between a second surface of the recessed edge and the media facing surface, wherein the second throat height is less than the first throat height such that the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the at least one outer portion.
5 more elements
A magnetic recording head, comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface, the first surface being disposed parallel to the media facing surface;
- and
- at least one outer portion disposed adjacent to the central portion, wherein:
- the recessed edge comprises one or more steps from the central portion to the at least one outer portion,
- each of the one or more steps comprises a first surface disposed substantially parallel to the media facing surface and a second surface coupled to the first surface,
- the at least one outer portion has a second throat height defined between the first surface of a first step of the one or more steps and the media facing surface, and
- the first throat height is greater than the second throat height such that the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the at least one outer portion.
9 more elements
A magnetic recording device comprising a magnetic recording head, the magnetic recording head comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface, the first surface being disposed parallel to the media facing surface;
- and
- at least one outer portion disposed adjacent to the central portion, wherein:
- the recessed edge comprises one or more steps from the central portion to the at least one outer portion,
- each of the one or more steps comprises a first surface disposed substantially parallel to the media facing surface and a second surface coupled to the first surface,
- the at least one outer portion has a second throat height defined between the first surface of a first step of the one or more steps and the media facing surface, and
- the first throat height is greater than the second throat height such that the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the at least one outer portion.
9 more elements
A magnetic recording head, comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface;
- a first outer portion disposed adjacent to the central portion, the first outer portion having a second throat height defined between a second surface of the recessed edge and the media facing surface, wherein the second throat height is less than the first throat height;
- and
- a second outer portion disposed adjacent to the central portion opposite to the first outer portion, the second outer portion having a third throat height defined between a third surface of the recessed edge and the media facing surface, wherein the third throat height is less than the first throat height, and wherein the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the first and second outer portions.
6 more elements
A magnetic recording device comprising a magnetic recording head, the magnetic recording head comprising:
- a main pole;
- and
- a trailing shield disposed adjacent to the main pole, the trailing shield comprising:
- a recessed edge disposed adjacent to the main pole;
- a media facing surface disposed opposite the recessed edge, the media facing surface being substantially planar;
- a central portion disposed adjacent to the main pole having a first throat height defined between a first surface of the recessed edge and the media facing surface;
- a first outer portion disposed adjacent to the central portion, the first outer portion having a second throat height defined between a second surface of the recessed edge and the media facing surface, wherein the second throat height is less than the first throat height;
- and
- a second outer portion disposed adjacent to the central portion opposite to the first outer portion, the second outer portion having a third throat height defined between a third surface of the recessed edge and the media facing surface, wherein the third throat height is less than the first throat height, and wherein the trailing shield is tapered along the recessed edge in a cross-track direction from the central portion towards the first and second outer portions.
6 more elements
Dependencies are inferred from the claim text.