Four-Shield Magnetic Head Layout for Stable Low-Noise Reproduction
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Solution Overview
Problem
Existing magnetic heads face challenges in achieving stable and noise-reduced signal reproduction due to large thermal fluctuations in thin magnetic layers, leading to unstable reproducing operations.
Innovation Solution
The magnetic head design incorporates a first magnetic member between four shields, with specific inclinations and distances to reduce thermal fluctuations, utilizing magnetic interactions for stable signal reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If thin magnetic layers are used in the magnetic head, then the device size is reduced, but thermal fluctuations increase leading to unstable reproducing operations
Solution Approach 1:
The patent applies asymmetry by configuring the shields with different orientations and positions relative to the magnetic layer. Specifically, the first and second shields are arranged at different angles to the magnetic layer plane, creating an asymmetric magnetic field distribution that stabilizes the magnetic moments and suppresses thermal fluctuations while maintaining thin magnetic layer dimensions
Solution Approach 2:
The patent introduces shields as intermediary elements between the magnetic layer and the external environment. These shields act as mediators that control and stabilize the magnetic field, preventing thermal fluctuations from disrupting the magnetic moments in the thin magnetic layer, thus ensuring stable reproducing operations
2Device complexity
If conventional shield configurations are used, then the device structure is simple, but noise is not sufficiently reduced affecting signal reproduction quality
Solution Approach 1:
The patent segments the shielding function into multiple independent shields (first shield, second shield, third shield, fourth shield) with different orientations and positions. This segmentation allows each shield to address specific noise sources and magnetic field disturbances independently, achieving superior noise reduction compared to conventional single or dual-shield configurations
Solution Approach 2:
The patent extends the shielding approach into multiple spatial dimensions by arranging shields at different angles and positions relative to the magnetic layer. The first and second shields are oriented at different angles in the plane, while the third and fourth shields provide additional dimensional control, creating a multi-dimensional noise suppression architecture
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 suppresses thermal fluctuations, reduces noise, and enables stable and sensitive signal reproduction by leveraging magnetic interactions between shields and the magnetic member.
Implementation Method 1
leveraging magnetic interactions between shields and the magnetic member
Data Source
AI summary
According to one embodiment, a magnetic head includes a reproducing section including a medium facing face. The reproducing section includes first to fourth shields, a first magnetic member, and first to third terminals. A direction from the first shield to the second shield is along a first direction. A second direction from the third shield to the fourth shield crosses the first direction. The first shield includes a first side including a first end and a first other end. The second shield includes a second side including a second end and a second other end. A distance along a third direction between the first end and the medium facing face is shorter than a distance along the third direction between the first other end and the medium facing face. The third direction crosses the medium facing face.