Magnetic Recording Head Spin-Torque Oscillator Width Ratio
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Solution Overview
Problem
High-frequency magnetic recording heads face challenges in achieving stable recording/reproduction characteristics due to the degradation of high-frequency oscillators when increased drive current is required for higher recording density, leading to unstable performance.
Innovation Solution
A magnetic recording head design incorporating a spin-torque oscillator with a lower end surface width smaller than the upper end surface width, and a specific ratio between these widths, allows for increased oscillation amplitude and high-frequency magnetic field intensity with lower drive current, stabilizing the magnetic domain structure and achieving stable recording/reproduction characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If drive current is increased to achieve higher recording density, then high-frequency magnetic field intensity is improved, but high-frequency oscillator degradation occurs leading to unstable recording/reproduction characteristic
Solution Approach 1:
The patent changes the geometric parameters of the high-frequency oscillator, specifically the width ratio between lower and upper end surfaces, to optimize magnetic field generation efficiency. This allows achieving the required magnetic field intensity with lower drive current, thereby preventing oscillator degradation and maintaining stable recording/reproduction characteristics
2Manufacturing precision
If drive current is increased to produce larger high-frequency magnetic field, then recording density is improved, but oscillator degradation makes stable recording/reproduction difficult to achieve
Solution Approach 1:
The patent optimizes the geometric parameters of the high-frequency oscillator structure, specifically setting the width ratio between lower and upper end surfaces within a specific range, to enhance magnetic field generation efficiency. This enables achieving high recording density with reduced drive current, thereby preventing oscillator degradation and ensuring stable recording/reproduction characteristics
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 design enables the production of a high-intensity high-frequency magnetic field with low drive current, ensuring stable recording/reproduction characteristics and improved recording density in magnetic disk drives.
Implementation Method 1
a spin-torque oscillator for use as a high-frequency oscillator is disposed between the main pole and trailing shield such that a high-frequency magnetic field from the oscillator is applied to a magnetic recording layer
Data Source
AI summary
According to one embodiment, a magnetic recording head includes a main pole, a trailing shield opposing the main pole with a write gap therebetween, and a high-frequency oscillator between a distal end portion of the main pole and the trailing shield configured to produce a high-frequency magnetic field. The high-frequency oscillator includes a lower end surface facing the recording medium and an upper end surface substantially parallel to the lower end surface. The width of the lower end surface in a track-width direction is smaller than that of the upper end surface.