Magnetic Head Shield Segmentation for Heat Dissipation
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Solution Overview
Problem
Current magnetic heads face challenges in increasing recording density and maintaining stable recording characteristics due to limitations in heat dissipation and side shield functionality, especially when the recording gap between the magnetic pole and the shield is small.
Innovation Solution
The magnetic head design includes a first shield with partial regions, a magnetic pole, a first magnetic layer, and a nonmagnetic member with specific portions and connections, which enhances heat dissipation and side shield effectiveness by strategically positioning and electrically connecting components to optimize the recording magnetic field and reduce heat transfer distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the recording gap between the magnetic pole and the shield is reduced to increase recording density, then recording density is improved, but heat dissipation becomes insufficient and recording characteristics become unstable
Solution Approach 1:
The shield is divided into multiple segments including a first shield, second shield, third shield, and fourth shield arranged in sequence. This segmentation creates multiple heat dissipation paths and allows each shield segment to independently manage thermal loads, solving the heat dissipation problem while maintaining the reduced recording gap for high recording density.
Solution Approach 2:
A nonmagnetic member is introduced as an intermediary component between the magnetic pole and the shields. This nonmagnetic member serves as a thermal management element that facilitates heat dissipation from the magnetic pole to the shields without interfering with the magnetic field, enabling stable recording characteristics at reduced gaps.
2Quantity of substance
If the recording gap is reduced to increase recording density, then recording density is improved, but side shield functionality deteriorates
Solution Approach 1:
The shield structure is segmented into four distinct shields (first, second, third, and fourth shields) with specific magnetic and nonmagnetic regions. This segmentation allows each shield to perform specialized functions including side shield suppression while maintaining the narrow recording gap, thereby preserving side shield effectiveness at high recording densities.
Solution Approach 2:
Different regions of the shield structure are assigned different magnetic properties (magnetic regions and nonmagnetic regions) to optimize local functions. The side shield regions are specifically configured with appropriate magnetic characteristics to effectively suppress side shields even when the recording gap is reduced, while other regions focus on heat dissipation or field generation.
3Reliability
If multiple shields and magnetic layers are added to improve heat dissipation and side shield function, then recording stability is improved, but device complexity increases
Solution Approach 1:
Multiple functions are merged into the shield structure itself. The shields simultaneously serve as magnetic field management elements, heat dissipation components, and side shield suppression mechanisms. This integration reduces the need for separate components and simplifies the overall device structure while maintaining recording stability.
Solution Approach 2:
The shield structure is designed with multi-functionality, where each shield segment performs multiple roles including magnetic field confinement, thermal management, and side shield suppression. This universal design approach achieves recording stability without proportionally increasing device complexity, as the same structural elements fulfill multiple purposes.
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 allows for increased recording density and reliability by efficiently applying the recording magnetic field and maintaining stable recording characteristics even at shorter recording gaps, while effectively dissipating heat and maintaining a strong side shield function.
Implementation Method 1
a nonmagnetic member with specific portions and connections, which enhances heat dissipation and side shield effectiveness by strategically positioning and electrically connecting components
Implementation Method 2
a magnetic pole provided between the first partial region and the second shield in the second direction
Data Source
AI summary
According to one embodiment, a magnetic head includes first and second shields, a magnetic pole, a first magnetic layer, and a first nonmagnetic member. The first shield includes first, second, and third partial regions. A first direction is from the second toward third partial region. The first partial region is between the second and third partial regions. A second direction from the first toward second shield crosses the first direction. The magnetic pole between the second and third partial regions in the first direction is provided between the first partial region and the second shield in the second direction. The first magnetic layer is provided between the magnetic pole and the second shield. The first nonmagnetic member includes first and second portions. The first portion is between the magnetic pole and the first magnetic layer. The second portion is between the second partial region and the second shield.