Recording Head Waveguide Pole Segmentation
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Solution Overview
Problem
In heat-assisted magnetic recording, positioning magnetic poles relative to a waveguide is challenging due to magnetic materials being poor optical materials, which leads to magnetic interference and reduced optical efficiency.
Innovation Solution
A data storage device with a write pole and a return pole magnetically coupled through a yoke, where a sloped pole piece extends closer to the waveguide than the pole body, allowing the waveguide to be positioned adjacent to the air bearing surface without magnetic flux return paths through the waveguide, reducing interference and enabling optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic poles are positioned close to the waveguide to improve writing efficiency, then writing efficiency is improved, but magnetic interference increases and optical efficiency decreases
Solution Approach 1:
The first pole is divided into two distinct portions: a first portion spaced from the waveguide to minimize magnetic interference, and a second portion extending closer to the waveguide to improve writing efficiency. This segmentation allows each portion to serve different functional requirements simultaneously.
Solution Approach 2:
Different portions of the first pole have different spatial relationships to the waveguide. The second portion is positioned closer to the waveguide than the first portion, creating local variations in magnetic field strength that optimize both writing efficiency and minimize interference in different regions.
2Productivity
If magnetic materials are positioned close to the waveguide to improve writing efficiency, then writing efficiency is improved, but optical efficiency decreases due to poor optical properties of magnetic materials
Solution Approach 1:
The first pole is segmented into portions at different distances from the waveguide. The second portion extends closer to maximize magnetic field effectiveness for writing, while the first portion remains spaced to minimize optical absorption and maintain optical efficiency.
Solution Approach 2:
The pole structure extends in multiple spatial dimensions relative to the waveguide, with the second portion of the first pole and the second pole positioned at different longitudinal distances from the waveguide end, creating a three-dimensional magnetic field distribution that optimizes both optical and magnetic performance.
3Measurement precision
If the waveguide is positioned adjacent to the air bearing surface to improve optical focusing, then optical efficiency is improved, but magnetic flux return paths through the waveguide increase causing interference
Solution Approach 1:
The first pole is divided into portions at different distances from the waveguide, allowing the second portion to provide magnetic field coverage near the air bearing surface while the first portion remains spaced to prevent magnetic flux return paths through the waveguide.
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 configuration enhances the optical efficiency of the recording head by minimizing magnetic interference and allowing for high-temperature processing of waveguide materials, improving writing efficiency and thermal stability.
Implementation Method 1
a beam of light is condensed to a small optical spot onto the storage medium to heat a portion of the medium
Implementation Method 2
to heat a portion of the medium and reduce the magnetic coercivity of the heated portion
Implementation Method 3
locally heating a storage medium to reduce the coercivity of the storage medium so that an applied magnetic writing field can more easily direct the magnetization
Implementation Method 4
a write pole and a return pole magnetically coupled through a yoke
Implementation Method 5
positioning the magnetic poles with respect to the focused spot in the waveguide. Magnetic materials such as alloys of Fe, Co and Ni are poor optical materials, so they cannot be positioned in close proximity with the waveguide for an appreciable distance
Data Source
AI summary
An apparatus having a first pole with a first side and a second side opposite from the first side, a second pole positioned on the first side of the first pole, and a waveguide positioned on the second side of the first pole wherein the waveguide has an end adjacent to an air bearing surface. The first pole includes a first portion spaced from the waveguide and a second portion extending from the first portion to the air bearing surface, with the second portion being structured such that an end of the second portion is closer to the waveguide than the first portion.