Multilayer Magnetic Head Reproduction at Tight Track Pitches
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Solution Overview
Problem
Existing magnetic heads face challenges in achieving high accuracy and low noise reproduction of data from magnetic recording media, particularly when track pitches are small, leading to difficulties in spatial resolution and signal integrity.
Innovation Solution
The magnetic head incorporates a reproducing section with a specific configuration of magnetic layers and nonmagnetic layers, including a first magnetic layer between a third magnetic layer and a second magnetic layer, where the magnetizations of these layers are aligned in orthogonal directions, and are antiferromagnetically coupled, with controlled thicknesses of nonmagnetic layers to enhance stability and signal differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional magnetic head structures are used, then device complexity is reduced, but measurement precision and spatial resolution deteriorate at small track pitches
Solution Approach 1:
The magnetic head's reproducing section is segmented into multiple magnetic layers (first magnetic layer, second magnetic layer, third magnetic layer) with distinct magnetization directions. This segmentation allows each layer to contribute to different aspects of signal detection, improving spatial resolution by enabling independent control and measurement of magnetic field components from each layer.
Solution Approach 2:
The patent introduces a third dimension to the magnetic layer configuration by adding magnetization components in orthogonal directions. The first and second magnetic layers have magnetization in a first direction, while the third magnetic layer has magnetization in a second direction orthogonal to the first. This dimensional expansion enables enhanced spatial resolution by detecting magnetic fields from multiple directions simultaneously.
2Measurement precision
If magnetic layers are configured to improve signal differentiation, then measurement precision improves, but noise increases
Solution Approach 1:
The magnetic layers are configured with asymmetric magnetization directions to enhance signal differentiation. The first and second magnetic layers have magnetization in one direction while the third magnetic layer has magnetization in an orthogonal direction. This asymmetric configuration creates distinct signal patterns that improve differentiation while the controlled thickness of nonmagnetic layers suppresses noise generation.
Solution Approach 2:
The patent optimizes the thickness parameters of nonmagnetic layers between the magnetic layers. By controlling the thickness of these nonmagnetic layers, the patent reduces noise generation from magnetic field interactions while maintaining the signal differentiation capabilities provided by the multi-layer magnetic structure.
3Productivity
If track pitch is reduced to increase storage density, then productivity improves, but measurement precision and spatial resolution deteriorate
Solution Approach 1:
The reproducing section is divided into multiple magnetic layers with distinct magnetization directions, allowing independent detection of magnetic field components. This segmentation enables the system to resolve smaller track pitches by detecting magnetic fields from multiple directions simultaneously, maintaining spatial resolution even at high storage densities.
Solution Approach 2:
By adding magnetization components in orthogonal directions through the third magnetic layer, the system gains an additional dimension for signal detection. This dimensional expansion enables accurate measurement of magnetic fields at smaller track pitches, allowing increased storage density without sacrificing spatial resolution.
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 the reproduction of signals with reduced noise and improved spatial resolution, enabling high TPI (tracks per inch) and accurate data retrieval even at tight track pitches, resulting in a magnetic head with enhanced characteristics.
Implementation Method 1
a first magnetic layer magnetization of the first magnetic layer includes a first component along a second direction crossing the medium facing face, a second magnetic layer magnetization of the second magnetic layer includes a second component along the second direction, a direction of the second component being opposite to a direction of the first component
Implementation Method 2
a third magnetic layer magnetization of the third magnetic layer includes a third component along a third direction crossing a plane including the first direction and the second direction
Data Source
AI summary
According to one embodiment, a magnetic head includes a reproducing section including a medium facing face. The reproducing section includes a first magnetic element including a first magnetic layer, a second magnetic layer, and a third magnetic layer. The first magnetic layer is provided between the third magnetic layer and the second magnetic layer in a first direction along the medium facing face. A first magnetic layer magnetization of the first magnetic layer includes a first component along a second direction crossing the medium facing face. A second magnetic layer magnetization of the second magnetic layer includes a second component along the second direction. A direction of the second component is opposite to a direction of the first component. A third magnetic layer magnetization of the third magnetic layer includes a third component along a third direction crossing a plane including the first direction and the second direction.