Convex Magnetic Pole Tip for High-Density Writeability
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Solution Overview
Problem
Conventional magnetic recording apparatuses face challenges in achieving high recording densities due to insufficient magnetic field strength and gradient, leading to poor writeability, especially at higher areal densities.
Innovation Solution
The design of a magnetic write apparatus with a convex top pole tip and conformal write gap, which increases the magnetic field volume while maintaining a constant track width, thereby enhancing the magnetic field strength and gradient without significantly compromising the field shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the pole size is reduced at higher recording densities, then the track width is maintained, but the magnetic field strength and gradient become insufficient
Solution Approach 1:
The patent transitions from a conventional flat-topped pole to a pole with a convex, dome-shaped top surface. This dimensional change in the pole geometry increases the magnetic field volume and enhances the magnetic field strength and gradient without increasing the track width, thereby resolving the contradiction between maintaining small pole size and achieving sufficient magnetic field strength for high-density recording.
2Productivity
If the pole size is reduced, then the recording density increases, but the writeability deteriorates due to insufficient magnetic field
Solution Approach 1:
By changing the pole top geometry from flat to convex dome-shaped, the patent increases the magnetic field volume and strength, thereby improving writeability while maintaining the small pole size required for high recording density.
Solution Approach 2:
The patent modifies the geometric parameters of the pole, specifically the curvature and height of the convex top surface, to optimize the magnetic field distribution. This parameter change enhances the magnetic field strength and gradient, improving writeability without compromising recording density.
3Force
If the magnetic field volume is increased, then the field strength and gradient improve, but the field shape may be compromised
Solution Approach 1:
The patent carefully controls the geometric parameters of the convex pole top, including the radius of curvature and height, to optimize both magnetic field strength and field shape. By adjusting these parameters, the design achieves enhanced field strength and gradient while maintaining the desired field shape for effective magnetic recording.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves the writeability and performance of magnetic recording apparatuses, particularly at higher areal recording densities, by providing a higher magnetic field and more desirable field gradient while maintaining the shape integrity.
Implementation Method 1
The magnetic write apparatus includes a pole with a convex top pole tip... increases the magnetic field volume while maintaining a constant track width, thereby enhancing the magnetic field strength and gradient
Data Source
AI summary
A magnetic write apparatus has a media-facing surface (MFS), a pole, a write gap, a top shield and coil(s). The pole includes a yoke and a pole tip. The pole tip includes a bottom, a top wider than the bottom and first and second sides. The pole tip has a height between the top and the bottom. At least part of the top of the pole tip is convex in a cross-track direction between the first and second sides such that the height at the MFS is larger between the first and second sides than at the first and second sides. The height increases in a yoke direction perpendicular to the MFS. The write gap is adjacent to and conformal with the top of the pole at the MFS and is between part of the top shield and the pole. The top shield is concave at the MFS.