Four-Layer Magnetic Head for Fast Magnetization Reversal
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Solution Overview
Problem
Existing magnetic heads face challenges in achieving high recording density and efficient magnetization reversal due to limitations in the design and configuration of their magnetic elements.
Innovation Solution
The magnetic head incorporates a specific configuration of magnetic layers and nonmagnetic layers between magnetic poles, with asymmetrical areas and angles to enhance magnetization oscillation and current density, allowing for high-speed and high-density recording operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional magnetic element configuration is used, then the device complexity is low, but the recording density and magnetization reversal efficiency are insufficient
Solution Approach 1:
The magnetic element is divided into multiple magnetic layers (first magnetic layer, second magnetic layer, third magnetic layer, fourth magnetic layer) with different orientations and functions. Each layer serves a specific purpose in achieving magnetization reversal and oscillation, allowing complex functionality to be achieved through modular layer structure rather than a monolithic design.
Solution Approach 2:
The patent employs asymmetric configuration where the first magnetic layer has a larger area than the fourth magnetic layer, and the magnetic layers are arranged with specific angular relationships (e.g., magnetization directions at specific angles to each other). This asymmetry creates optimized magnetic field distribution and current density patterns that enhance recording density and magnetization reversal efficiency.
2Speed
If the magnetic layer areas are made asymmetrical, then the oscillation strength and magnetization reversal speed improve, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies particular parameter ranges for the magnetic layers, including area ratios (first magnetic layer area larger than fourth magnetic layer area), thickness ranges, and angular relationships between magnetization directions. By optimizing these parameters within defined ranges, the design achieves high-speed magnetization reversal while providing clear manufacturing specifications that guide precision control.
Solution Approach 2:
The magnetic element uses composite structure with multiple magnetic layers having different magnetic properties (different magnetization directions, different coercive forces). This composite approach allows the system to achieve high-speed reversal through synergistic interaction between layers, where each layer's specific properties contribute to the overall performance while the layered structure provides tolerance to manufacturing variations.
3Strength
If multiple magnetic layers with different orientations are used, then the oscillation strength increases, but the device complexity increases
Solution Approach 1:
The magnetic element is segmented into four distinct magnetic layers, each with specific magnetization orientations. The first and third magnetic layers have magnetization directions oriented at specific angles relative to the second and fourth layers. This segmentation allows the system to generate strong oscillation through constructive interference of magnetic moments while maintaining a systematic layered structure that is more manageable than a fully complex three-dimensional arrangement.
Solution Approach 2:
The patent utilizes angular orientation in the magnetic layer configuration, introducing a directional dimension to the layered structure. By arranging magnetization directions at specific angles (e.g., perpendicular or oblique orientations between layers), the system achieves enhanced oscillation strength through three-dimensional magnetic field interactions while maintaining a planar layered structure that avoids the complexity of fully three-dimensional magnetic element geometries.
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 enables improved oscillation strength and high-speed magnetization reversal, resulting in enhanced recording density and efficiency.
Implementation Method 1
enhance magnetization oscillation and current density, allowing for high-speed and high-density recording operations
Data Source
AI summary
According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a magnetic element. The magnetic element is provided between the first magnetic pole and the second magnetic pole in a first direction from the first magnetic pole to the second magnetic pole. The magnetic element includes a first magnetic layer provided between the first magnetic pole and the second magnetic pole, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a third magnetic layer provided between the second magnetic layer and the second magnetic pole, and a fourth magnetic layer provided between the third magnetic layer and the second magnetic pole. The first magnetic layer includes a first face facing the first magnetic pole. The fourth magnetic layer includes a second face facing the second magnetic pole.