Apparatus for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorQuan-Chiu Harry Lam
Life of this patent
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Abstract
An apparatus for providing transverse magnetic bias proximate to a pole tip to speed up the switching time of the pole-tip during the writing operation is disclosed. The transverse field disposed proximate the pole-tip helps the conventional driving field in rotating the magnetization through the first 90-degrees, especially at small angle where the effective anisotropy-field is strongest in opposing the conventional driving field. By offsetting the magnetization from its easy-axis, the transverse field also increases the torque that the collinear driving field would have on the magnetization.
Claims27
An assisted pole tip arrangement, comprising:
- a pole tip;
- and
- a magnetic bias field source disposed proximate to the pole tip for providing a magnetic bias field for enhancing magnetization switching of the pole tip;
- wherein the magnetic bias field is generated by bias-current flowing perpendicularly to an air bearing surface through the magnetic bias source.
A magnetic head, comprising:
- a first pole and a second pole, the first and second pole being separated to form a write gap at a pole tip;
- a coil disposed between the first and second poles for producing at the write gap magnetic fields used to record data;
- and
- a magnetic bias field source disposed proximate to the pole tip for providing a magnetic bias field for enhancing magnetization switching of the pole tip;
- wherein the magnetic bias field is generated by bias-current flowing through the magnetic bias field source perpendicular to an air bearing surface.
A magnetic data storage system, comprising:
- at least one magnetic storage medium;
- a magnetic head, for reading data from and writing data to the at least one magnetic storage medium;
- a media translater for moving the at least one magnetic storage medium relative to the transducer;
- and
- a signal processing system, coupled to the media translater and to the magnetic head, for processing signals for the magnetic head and for controlling the media translater;
- wherein the magnetic head further comprises:
- a first pole and a second pole, the first and second pole being separated to form a write gap at a pole tip;
- a coil disposed between the first and second poles for producing at the write gap magnetic fields used to record data;
- and
- a magnetic bias field source disposed proximate to the pole tip for providing a magnetic bias field for enhancing magnetization switching of the pole tip;
- wherein the magnetic bias field is generated by bias-current flowing perpendicularly to an air bearing surface through the magnetic bias field source.
An assisted pole tip arrangement, comprising:
- means for providing magnetic fields for recording data on a magnetic recording medium;
- and
- means, operatively coupled to the means for providing magnetic field for recording data on a magnetic recording medium, for providing a magnetic bias field for enhancing magnetization switching of the means for providing magnetic fields for recording data on a magnetic recording medium;
- wherein the magnetic bias field is generated by bias-current flowing perpendicularly to an air bearing surface through the means for providing a magnetic bias field.
A magnetic head, comprising:
- means for providing a path for magnetic fields used to record data on a magnetic recording medium;
- means, coupled to the means for providing a path, for producing the magnetic fields used to record data;
- and
- means, coupled to the means for providing a path, for providing a magnetic bias field for enhancing magnetization switching of the means for providing a path for magnetic fields;
- wherein the magnetic bias field is generated by bias-current flowing perpendicularly to an air bearing surface through the means for providing a magnetic bias field.
Dependencies are inferred from the claim text.