Magnetic Head Multilayer Configuration for Magnetization Stability
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Solution Overview
Problem
Current magnetic recording devices face challenges in enhancing recording density due to instability in magnetization of magnetic poles, which affects the efficiency of oscillation and recording processes.
Innovation Solution
The magnetic head design incorporates a specific configuration of magnetic and non-magnetic layers, including a fifth magnetic layer with elements like Fe, Co, or Ni, and non-magnetic layers such as Ru, Ir, Ta, Rh, Pd, Pt, and W, to stabilize magnetization and facilitate high-intensity oscillations, thereby improving recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional magnetic head structure is used, then the device complexity is low, but the magnetization stability is poor leading to reduced recording density
Solution Approach 1:
The magnetic element is divided into multiple magnetic layers (first through fifth magnetic layers) with distinct functions. The fifth magnetic layer specifically addresses magnetization stability while other layers handle different aspects of the magnetic circuit, allowing optimization of each layer's properties independently to resolve the contradiction between stability and complexity.
Solution Approach 2:
The patent employs composite magnetic layer structures combining different magnetic materials with specific properties. The fifth magnetic layer uses a composite structure that stabilizes magnetization, while non-magnetic layers are strategically positioned to control magnetic field distribution, achieving improved reliability through material composition rather than simple structural repetition.
2Reliability
If the magnetic head uses more magnetic layers to stabilize magnetization, then the magnetization stability improves, but the manufacturing precision requirements increase
Solution Approach 1:
Different magnetic layers are assigned different local qualities and functions. The fifth magnetic layer specifically targets magnetization stability with optimized local properties, while other layers handle different magnetic circuit functions. This localized optimization allows each layer to be tuned independently, reducing the cumulative precision burden compared to optimizing a single uniform structure.
Solution Approach 2:
The patent optimizes specific parameters of the fifth magnetic layer (such as thickness, material composition, and magnetization direction) to achieve stability. By changing key parameters of specific layers rather than uniformly adjusting all layers, the manufacturing precision requirements are concentrated on critical dimensions while other dimensions can tolerate broader tolerances.
3Productivity
If a simple magnetic layer configuration is used, then the ease of manufacture is high, but the oscillation intensity is insufficient for high-density recording
Solution Approach 1:
The magnetic element structure is designed to enable dynamic oscillation behavior. The fifth magnetic layer and associated non-magnetic layers create a configuration that supports high-intensity oscillations necessary for high-density recording. This dynamic capability is built into the layer structure itself, allowing the system to achieve high productivity through controlled oscillation rather than static field application.
Solution Approach 2:
The magnetic recording process utilizes periodic oscillation of the magnetic element to achieve high-density recording. The layered structure is specifically designed to support this periodic action, with the fifth magnetic layer tuned to oscillate at frequencies and intensities that enable enhanced recording density. The periodic oscillation allows multiple recording operations within the same physical space over time.
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 stabilizes the magnetization of the fifth magnetic layer, leading to efficient oscillations and enhanced recording density in magnetic recording devices.
Implementation Method 1
The fifth magnetic layer includes a first element and at least one of Fe, Co or Ni... This configuration stabilizes the magnetization of the fifth magnetic layer
Implementation Method 2
leading to efficient oscillations and enhanced recording density in magnetic recording devices
Data Source
AI summary
According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a magnetic element provided between the first and the second magnetic poles. The magnetic element includes first to fifth magnetic layers, and first to sixth non-magnetic layers. The fifth magnetic layer includes a first element and at least one of Fe, Co or Ni. The first element includes at least one selected from the group consisting of Cr, V, Mn, Ti, N and Sc. The fifth non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W. The sixth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag.