Wine Glass Trailing Shield for Magnetic Write Field Control
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Solution Overview
Problem
Current magnetic recording technologies face challenges in achieving high areal density recording due to limitations in the effective magnetic write field and track width, particularly as the size of the main pole decreases, leading to issues with stray field interference and magnetic field concentration.
Innovation Solution
The introduction of a wine glass-shaped trailing shield with varying wall angles and a trapezoidal cavity design adjacent to the main pole, which enhances the effective magnetic write field by minimizing magnetic field concentration and allowing for a narrower magnetic write width, while also simplifying the fabrication process by enabling smaller wall angles in the main pole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the main pole is decreased to achieve higher areal density recording, then the recording density is improved, but the magnetic field concentration and stray field interference increase
Solution Approach 1:
A trailing shield is introduced as an intermediary component between the main pole and the recording medium. This shield structure with varying wall angles (smaller at the front, larger at the back) acts as a mediator to control and shape the magnetic field, reducing stray field interference and magnetic field concentration while maintaining the benefits of a smaller main pole size for high areal density recording
2Reliability
If a traditional shield design is used, then the magnetic field control is provided, but the fabrication complexity increases
Solution Approach 1:
The shield design employs parameter changes in the form of varying wall angles along the length of the shield. The wall angle is smaller near the front (closer to the main pole) and larger toward the back, creating a gradient structure that optimizes magnetic field control while maintaining manufacturability through a systematic geometric progression rather than complex irregular shapes
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 results in consistently higher effective writing fields and narrower magnetic write widths, improving recording performance and reducing manufacturing costs by allowing for easier fabrication of the main pole.
Implementation Method 1
The shield has throat and mouth regions respectively separated from the main pole by different first and second distances. The throat region is the closest point between the shield and the main pole.
Data Source
AI summary
A write element for magnetic recording includes a main pole and a shield. The main pole has first and second sides with respect to a down-track direction. The shield at least partially surrounds the main pole with a continuously concave inner sidewall. The angle between the inner sidewall of the shield and the direction of motion of the write element is greater than the angle between the sides of the main pole and the direction of motion.