High-Frequency Oscillator in Magnetic Recording Head
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Solution Overview
Problem
The manufacture of recording heads for high-frequency assisted recording faces challenges due to variations in magnetic pole shape and resonance properties, making it difficult to produce under optimal conditions for high recording density.
Innovation Solution
A magnetic recording head is designed with a main magnetic pole, a write shield, a recording coil, a high-frequency oscillator within the write gap, and a low pass filter, along with a modulation insulating layer and electrode, to improve matching with the resonance property of the recording medium, enhancing recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-frequency oscillator is disposed between the main magnetic pole and write shield, then high-frequency assisted recording is enabled, but manufacturing precision deteriorates due to variations in magnetic pole shape and resonance property
Solution Approach 1:
The patent applies parameter changes by introducing a modulation electrode that can dynamically adjust the oscillation frequency of the high-frequency oscillator. This allows the system to adapt to manufacturing variations in magnetic pole shape and resonance properties by tuning the oscillation frequency parameter, thereby maintaining optimal recording performance despite manufacturing tolerances
Solution Approach 2:
The patent implements dynamics by making the oscillation frequency adjustable through the modulation electrode rather than fixed. This dynamic adjustment capability enables the system to compensate for manufacturing variations and optimize performance in real-time, transforming a static structure into an adaptive system that can handle manufacturing precision limitations
2Productivity
If a high-frequency oscillator is disposed within the write gap, then high-frequency assisted recording is achieved, but magnetic field leakage increases
Solution Approach 1:
The patent uses the modulation electrode as an intermediary element that controls the high-frequency oscillator's operation. This intermediary structure allows for precise control of the magnetic field generation, enabling the system to achieve high-frequency assisted recording while minimizing unwanted magnetic field leakage through controlled activation and frequency modulation
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 high-frequency assisted recording with improved recording density by stabilizing the oscillating frequency and reducing magnetic field leakage, enabling efficient data storage.
Implementation Method 1
a high-frequency oscillator that is disposed within the write gap between the main magnetic pole and the write shield
Implementation Method 2
the high-frequency oscillator is a spin torque oscillator
Data Source
AI summary
A magnetic recording head includes a main magnetic pole that applies a recording magnetic field to a recording layer of a recording medium, a write shield that faces the main magnetic pole with a write gap therebetween, a recording coil that generates a magnetic field in the main magnetic pole, a high-frequency oscillator that includes a field generation layer and a spin injection layer, and is disposed within the write gap between the main magnetic pole and the write shield, a wiring electrically connected to the high-frequency oscillator, a modulation electrode that applies a modulation voltage to the field generation layer, and a modulation insulating layer that is interposed between the field generation layer and the modulation electrode.