Magnetic Recording Head With Segmented Magnetic Path
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Solution Overview
Problem
Magnetic recording heads face challenges in achieving stable high frequency assist and high recording density due to strong magnetic fields within the recording gap, which hinder the oscillation of high frequency oscillators and result in increased error rates and reduced recording ability.
Innovation Solution
The magnetic recording head design includes a main magnetic pole, a write shield, a recording coil, and a high frequency oscillator, with a magnetic element made of soft magnetic material positioned within the write gap, forming a magnetic path that bypasses the high frequency oscillator, allowing for a reduced magnetic field within the write gap and improved oscillation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a strong magnetic field is applied from the recording gap to the recording medium to improve recording density, then recording ability is improved, but oscillation of the high frequency oscillator becomes difficult to achieve
Solution Approach 1:
The magnetic path is segmented into two separate paths: one through the magnetic core (main magnetic pole and write shield) for strong magnetic field recording, and another through the magnetic element for high frequency oscillator oscillation. This segmentation allows independent optimization of each function without interference.
Solution Approach 2:
The magnetic element acts as an intermediary component that provides a dedicated magnetic path for the high frequency oscillator. By introducing this intermediate magnetic path, the system can maintain strong magnetic fields for recording while simultaneously providing a controlled magnetic environment for oscillator operation.
2Manufacturing precision
If a strong magnetic field is applied within the write gap to improve recording ability, then recording density increases, but error rates increase due to unfavorable oscillator oscillation
Solution Approach 1:
The magnetic circuit is divided into separate functional paths: the magnetic core provides the strong magnetic field for recording, while the magnetic element provides a separate magnetic path for oscillator operation. This segmentation eliminates the conflict between strong magnetic fields and oscillator stability, simultaneously improving recording density and reducing error rates.
3Reliability
If the magnetic field within the recording gap is reduced to enable high frequency oscillator oscillation, then oscillation stability improves, but recording ability deteriorates
Solution Approach 1:
The magnetic path is segmented into two independent routes: one through the magnetic core for strong magnetic field generation during recording, and another through the magnetic element for providing a controlled magnetic environment for oscillator oscillation. This allows both strong recording fields and stable oscillator operation to coexist.
Solution Approach 2:
The magnetic element serves as an intermediary that creates a dedicated magnetic path for the high frequency oscillator, isolated from the strong magnetic fields generated by the magnetic core. This intermediary structure enables the oscillator to operate stably while the magnetic core maintains strong magnetic fields for high-quality recording.
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 favorable oscillation of the high frequency oscillator, reducing error rates and enhancing recording density by optimizing the magnetic field within the write gap, thus improving the recording ability and stability of the magnetic recording head and disk device.
Implementation Method 1
a magnetic element that is made of a soft magnetic material, is positioned within the write gap and separated from the high frequency oscillator, and is configured to form a magnetic path that passes through the main magnetic pole, the magnetic element, and the write shield, and not through the high frequency oscillator
Implementation Method 2
a high frequency oscillator, for example, a spin torque oscillator, is disposed between a medium-side end portion of the write shield magnetic pole that faces the main magnetic pole and the main magnetic pole
Data Source
AI summary
A magnetic recording head includes a main magnetic pole that generates a recording magnetic field in a direction perpendicular to a recording layer, a write shield with a surface that faces a trailing side of the main magnetic pole, so that a write gap is interposed between the surface and the main magnetic pole, the write shield forming a magnetic core together with the main magnetic pole, a recording coil, a high frequency oscillator within the write gap, a wiring through which a current can flow through the main magnetic pole, the high frequency oscillator, and the write shield in series, and a magnetic element made of soft magnetic material, positioned within the write gap and separated from the high frequency oscillator, and configured to form a magnetic path passing through the main magnetic pole, the magnetic element, and the write shield, and not through the high frequency oscillator.