Magnetic Head Side Shield Vertical Positioning
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Solution Overview
Problem
In magnetic heads for perpendicular magnetic recording, the arrangement of side shields on the spin-torque oscillator leads to a skewed magnetic field, reducing the oscillator's oscillation and making it difficult to produce a high-frequency magnetic field effectively, which in turn affects recording density and bit error rates.
Innovation Solution
The magnetic head design includes side shields positioned individually on opposite sides of the main pole, magnetically separated and located higher than the spin-torque oscillator, preventing magnetic flux leakage and ensuring the magnetic field flows at right angles to the film surface, thus enhancing the oscillator's oscillation and recording density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If side shields are arranged individually on the opposite sides of the spin-torque oscillator, then magnetic flux leakage is reduced, but the magnetic field becomes skewed and oscillator oscillation is reduced
Solution Approach 1:
The side shields are repositioned from a horizontal arrangement (at the same height as the oscillator) to a vertical arrangement (above the oscillator). This dimensional change in positioning allows the shields to contain magnetic flux without interfering with the oscillator's magnetic field generation, resolving the contradiction between flux containment and oscillator performance
2Object-generated harmful factors
If side shields are positioned at the same height as the spin-torque oscillator, then magnetic flux containment is improved, but the magnetic field becomes skewed and recording density is reduced
Solution Approach 1:
The side shields are positioned in the vertical dimension (above the oscillator) rather than in the horizontal dimension (at the same height). This allows effective magnetic flux containment without skewing the magnetic field in the horizontal plane, thereby maintaining recording density
3Object-generated harmful factors
If side shields are arranged to contain magnetic flux, then leakage to adjacent tracks is reduced, but oscillator performance deteriorates
Solution Approach 1:
By positioning the side shields vertically above the oscillator rather than horizontally alongside it, the shields effectively contain magnetic flux leakage to adjacent tracks while avoiding interference with the oscillator's magnetic field generation in the horizontal plane
Solution Approach 2:
The side shields act as magnetic flux mediators that redirect and contain the magnetic field lines, guiding them back toward the main pole while preventing leakage to adjacent tracks, without directly interfering with the oscillator's operation
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 improves bit error rates and increases track density by preventing magnetic flux leakage to adjacent tracks while maintaining high-frequency magnetic field application, enhancing the overall recording performance.
Implementation Method 1
a spin-torque oscillator between the main pole and a surface of the return pole opposed thereto, configured to produce a high-frequency magnetic field
Implementation Method 2
The main pole produces a perpendicular magnetic field
Implementation Method 3
The coil serves to pass magnetic flux through the main pole
Implementation Method 4
The return pole is located on the trailing side of the main pole with a write gap therebetween and closes a magnetic path between itself and a magnetic disk
Data Source
AI summary
According to one embodiment, a magnetic head includes a main pole configured to produce a recording magnetic field, a return pole opposed to a trailing side of the main pole across a write gap and configured to return magnetic flux from the main pole, a coil configured to excite the main pole, a spin-torque oscillator between the main pole and a surface of the return pole, configured to produce a high-frequency magnetic field, and side shields individually on opposite sides of the main pole transversely relative to a track, magnetically separated from the main pole, and located at a height position above the recording medium higher than that of the spin-torque oscillator.