Apparatus and method for writing to magnetic media using an AC bias current to enhance the write field
First Claim
1. A data storage device, comprising:
- a magnetic recording medium;
a main pole;
a trailing shield;
a write-field-enhancing structure disposed within a write gap between the main pole and the trailing shield, the write-field-enhancing structure comprising;
a spacer disposed between the main pole and the trailing shield, wherein the spacer is non-magnetic,a non-magnetic layer disposed between the main pole and the trailing shield, anda free layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer, wherein the free layer is magnetic;
a write coil configured to magnetize the main pole;
a write current control circuit configured to supply a write current to the write coil to record a bit to the magnetic recording medium, wherein the write current comprises a write pulse; and
a driving current control circuit configured to supply a driving current to the write-field-enhancing structure, wherein the driving current comprises a driving pulse, wherein an amplitude of the driving pulse is dependent on a power constraint.
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Accused Products
Abstract
Disclosed herein are apparatuses and methods for writing to a magnetic medium, and data storage devices comprising such apparatuses and methods. An apparatus comprises a main pole, a trailing shield, a write-field-enhancing structure, a write coil, a write current control circuit configured to supply a write current to the write coil to record a bit to a magnetic medium, and a driving current control circuit configured to supply a driving current to the write-field-enhancing structure, wherein the driving current comprises a driving pulse. A method of writing to a magnetic medium comprises supplying a write current to a write coil of a magnetic write head, and supplying a driving current to a free layer disposed in a write gap between a main pole and a trailing shield of the magnetic write head, wherein the driving current comprises an AC component.
123 Citations
20 Claims
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1. A data storage device, comprising:
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a magnetic recording medium; a main pole; a trailing shield; a write-field-enhancing structure disposed within a write gap between the main pole and the trailing shield, the write-field-enhancing structure comprising; a spacer disposed between the main pole and the trailing shield, wherein the spacer is non-magnetic, a non-magnetic layer disposed between the main pole and the trailing shield, and a free layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer, wherein the free layer is magnetic; a write coil configured to magnetize the main pole; a write current control circuit configured to supply a write current to the write coil to record a bit to the magnetic recording medium, wherein the write current comprises a write pulse; and a driving current control circuit configured to supply a driving current to the write-field-enhancing structure, wherein the driving current comprises a driving pulse, wherein an amplitude of the driving pulse is dependent on a power constraint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of writing to a magnetic medium, the method comprising:
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supplying a write current to a write coil of a magnetic write head; supplying a driving current to a free layer disposed in a write gap between a main pole and a trailing shield of the magnetic write head, wherein the driving current comprises an AC component; and selecting a duty cycle of the AC component based at least in part on a power constraint. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for electrically biasing a write-field-enhancing structure of a magnetic write head in a data storage device, the method comprising:
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determining an amplitude of an AC component of a driving current; determining an amplitude of a DC component of the driving current; generating the AC component based at least in part on the determined amplitude of the AC component; generating the DC component based at least in part on the determined amplitude of the DC component; providing the AC component to the write-field-enhancing structure; and providing the DC component to the write-field-enhancing structure.
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Specification