Magnetic Write Head Uniform Gap Shielding for Erase Band Minimization
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Solution Overview
Problem
Current magnetic recording technologies face challenges in achieving high-density recording while minimizing errors and maintaining surface recording density, particularly due to the generation of erase bands caused by tilt angles of the main magnetic-pole layer, which necessitates wider track pitches and reduces data transfer rates.
Innovation Solution
A magnetic recording device and method that utilizes a magnetic write head with uniform gaps between the magnetic pole, side shields, and leading shield, allowing the head to travel across write tracks from outer to inner or inner to outer, minimizing the erase band width and optimizing surface recording density without reducing effective write track width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the track pitch is widened to avoid miswriting errors, then reliability is improved, but surface recording density is reduced
Solution Approach 1:
The patent applies local quality by providing the bevel angle specifically at the side ends of the main magnetic-pole layer, rather than uniformly across the entire structure. This localized geometric modification concentrates the erase band suppression effect precisely where it is needed (at the track edges) without affecting the overall track pitch, thereby maintaining high surface recording density while preventing miswriting errors.
2Manufacturing precision
If side shield layers are provided to suppress spread of recording magnetic field, then manufacturing precision is improved, but device complexity is increased
Solution Approach 1:
The patent extracts the essential function of field confinement from the complex side shield layer structure and implements it through the simpler bevel angle geometry at the magnetic-pole layer ends. This removes the need for additional side shield layers while maintaining the magnetic field control function, thereby reducing device complexity without sacrificing recording precision.
3Reliability
If data recording blocks are arranged to prevent overlap, then reliability is improved, but productivity is reduced
Solution Approach 1:
The patent converts the potentially harmful overwrite effect into a beneficial feature by deliberately designing the bevel angle to suppress erase bands at track edges. This allows subsequent tracks to be written closer together without causing miswriting errors, enabling more aggressive track spacing and faster rewriting processing while maintaining data integrity through the geometric field confinement.
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 approach improves format efficiency, increases data transfer rates, and enhances surface recording density by maintaining uniform distances between the magnetic pole and shields, thereby reducing errors and increasing linear recording density.
Implementation Method 1
A magnetic write head includes a thin film coil for generating magnetic flux
Implementation Method 2
a main magnetic-pole layer guiding the magnetic flux, which is generated in the thin film coil, to a magnetic recording medium
Data Source
AI summary
A magnetic disk device includes: a recording medium provided with a plurality of write tracks; a magnetic write head including a magnetic pole, side shields, and a leading shield, a distance from the magnetic pole to each of the side shields being maintained to be uniform with a gap layer therebetween, and a distance from the magnetic pole to the leading shield being maintained to be uniform with a gap layer therebetween; and a control section rotating the recording medium, and allowing magnetic information to be recorded on the recording medium while allowing the magnetic write head to travel in a direction from an inner write track toward an outer write track or in a direction from the outer write track toward the inner write track, across write tracks in the recording medium. With such a configuration, format efficiency may be improved, and a width of an erase band on a magnetic disk may be minimized. Therefore, surface recording density of a recording medium may be improved without reducing an effective write track width.