Magnetic Head Pole-Layer Distance for Oscillation Stability
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Solution Overview
Problem
Current magnetic heads face challenges in increasing recording density due to difficulties in generating stable oscillations and magnetization reversals, particularly with the magnetic pole's influence on the first magnetic layer, which affects oscillation generation and magnetization control.
Innovation Solution
The magnetic head design includes a magnetic pole, a first shield, a first magnetic layer, a second magnetic layer, and an intermediate nonmagnetic layer, with a specific distance relationship between the magnetic pole and the magnetic layers to enhance oscillation stability and magnetization control, allowing for increased recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic pole is positioned close to the first magnetic layer to enhance magnetization control, then magnetization reversal efficiency is improved, but oscillation stability deteriorates due to excessive magnetic pole influence
Solution Approach 1:
A nonmagnetic intermediate layer is introduced between the first magnetic layer and the second magnetic layer to mediate the magnetic field interaction. This intermediate layer acts as a buffer that allows effective magnetization control while reducing the destabilizing influence of the magnetic pole on the oscillation dynamics, thereby resolving the contradiction between magnetization reversal efficiency and oscillation stability.
Solution Approach 2:
The patent optimizes the thickness parameters of the magnetic layers and the intermediate layer to achieve the desired balance. By carefully controlling the thickness of the first magnetic layer, the intermediate layer, and the second magnetic layer, the system achieves both effective magnetization reversal and stable oscillations through parameter optimization.
2Stability of the object's composition
If the distance between the magnetic pole and the first magnetic layer is increased to stabilize oscillations, then oscillation stability is improved, but recording density decreases due to reduced magnetic field strength
Solution Approach 1:
The patent employs a composite magnetic layer structure consisting of a first magnetic layer, a nonmagnetic intermediate layer, and a second magnetic layer. This composite structure allows the system to maintain strong magnetic field interaction for high recording density while the nonmagnetic intermediate layer provides oscillation stability, effectively resolving the contradiction between recording density and oscillation stability.
Solution Approach 2:
The nonmagnetic intermediate layer serves as an intermediary that enables the system to achieve both close proximity for strong magnetic coupling (high recording density) and oscillation stability. The intermediate layer transmits the magnetic field effectively while preventing excessive magnetic pole influence that would destabilize oscillations.
3Device complexity
If a single magnetic layer is used to simplify the structure, then device complexity is reduced, but oscillation stability and magnetization control deteriorate
Solution Approach 1:
The magnetic layer is segmented into a first magnetic layer and a second magnetic layer separated by a nonmagnetic intermediate layer. This segmentation allows the system to achieve stable oscillations and improved magnetization control by distributing the magnetic field interaction across multiple layers, with each layer performing a specific function in the oscillation and magnetization process.
Solution Approach 2:
Different regions of the magnetic structure are assigned different properties: the first magnetic layer is optimized for strong magnetic coupling with the magnetic pole, the intermediate layer is nonmagnetic to provide stability, and the second magnetic layer is optimized for oscillation dynamics. This local quality differentiation resolves the contradiction between structural simplicity and oscillation stability.
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 stable oscillations and improved magnetization reversal, leading to increased recording density and efficient magnetic recording and reproduction capabilities.
Implementation Method 1
a magnetic pole; a first magnetic layer provided between the magnetic pole and the first shield
Implementation Method 2
an intermediate layer provided between the first magnetic layer and the second magnetic layer, the intermediate layer being nonmagnetic
Data Source
AI summary
According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a first magnetic layer provided between the magnetic pole and the first shield, a second magnetic layer provided between the first magnetic layer and the first shield, and an intermediate layer provided between the first magnetic layer and the second magnetic layer. The intermediate layer is nonmagnetic. A first distance between the magnetic pole and the first magnetic layer along a first direction is not less than 1% and not more than 10% of a second distance between the magnetic pole and the first shield along the first direction. The first direction is from the first magnetic layer toward the second magnetic layer.