Stacked Magnetic Head Segmentation for High Density Recording
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Solution Overview
Problem
Current magnetic heads face challenges in increasing recording density due to limitations in the orientation and application of the magnetic field to the recording medium, particularly when the write gap is small, leading to inefficiencies in magnetic field distribution and recording density.
Innovation Solution
The magnetic head incorporates a stacked body with a first magnetic region and a second magnetic region, where the second magnetic region has a higher saturation magnetization than the first, and an intermediate region, allowing for effective magnetization reversal and improved magnetic field orientation towards the recording medium, even at small write gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional magnetic head structure is used, then the structure is simple, but the recording density cannot be increased effectively
Solution Approach 1:
The magnetic layer is segmented into multiple regions with different saturation magnetizations (first magnetic region with lower Ms and second magnetic region with higher Ms). This segmentation allows different portions of the magnetic layer to respond differently to the write head's magnetic field, enabling effective magnetization reversal at high recording densities while maintaining a relatively simple overall head structure.
Solution Approach 2:
Different regions of the magnetic layer are assigned different local magnetic properties (different saturation magnetizations). The first magnetic region has lower saturation magnetization making it easier to reverse, while the second magnetic region has higher saturation magnetization providing stability. This local differentiation of magnetic properties enables high-density recording by allowing precise control of magnetization reversal in specific regions.
2Manufacturing precision
If the write gap is made small to increase recording density, then the recording density improves, but the magnetic field distribution becomes inefficient
Solution Approach 1:
The magnetic layer is differentiated into regions with different saturation magnetizations to match the local magnetic field distribution. The first magnetic region with lower Ms is positioned where the magnetic field is weaker, while the second magnetic region with higher Ms is positioned where the magnetic field is stronger. This local matching optimizes the utilization of the write head's magnetic field, improving efficiency even when the write gap is small.
Solution Approach 2:
The saturation magnetization parameter is changed across different regions of the magnetic layer. By varying the saturation magnetization from lower in the first magnetic region to higher in the second magnetic region, the system adapts to the non-uniform magnetic field distribution that occurs with small write gaps, thereby maintaining efficient magnetic field utilization and achieving high recording density.
3Manufacturing precision
If a single magnetic layer is used, then the structure is simple, but the magnetic field application effectiveness is reduced
Solution Approach 1:
The single magnetic layer is segmented into multiple functional regions (first magnetic region and second magnetic region) with different saturation magnetizations. This segmentation within a single continuous layer structure allows the system to achieve effective magnetic field application across different regions without requiring multiple separate layers, thus improving magnetic field application effectiveness while limiting structural complexity.
Solution Approach 2:
Different regions within the magnetic layer are assigned different local magnetic properties through controlled variations in saturation magnetization. The first magnetic region has lower saturation magnetization for easier reversal, while the second magnetic region has higher saturation magnetization for greater stability. This local differentiation within a unified layer structure optimizes magnetic field application effectiveness without significantly increasing structural complexity.
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 enhances recording density by effectively applying the magnetic field to the recording medium, reducing the reversal current density and allowing for stable high-density recording.
Implementation Method 1
When a current flows in the stacked body, a spin torque is generated, and a magnetization of the third layer has a component in a reverse orientation of a magnetic field generated from the magnetic pole
Data Source
AI summary
According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.