Write Pole Milling for Magnetic Flux Concentration
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Solution Overview
Problem
The reduction in physical and magnetic footprint of write poles in data writers for increased data storage capacity leads to diminished effective magnetic field output and compromised performance metrics, such as overwrite and bit error rates, making it challenging to maintain acceptable performance while scaling down.
Innovation Solution
A write pole is constructed using a combination of rotational and static milling operations to form a continuous pole sidewall with a 14.5° taper angle and 0° tip portion, utilizing shadowing effects to increase the magnetic area without compromising data writing performance, by precisely shaping the body and tip regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the physical footprint of the write pole is reduced to increase data storage capacity, then the magnetic field output is diminished and performance metrics are compromised
Solution Approach 1:
The write pole is designed with non-uniform geometry featuring a tapered body portion and a perpendicular tip portion. The body taper angle (14.5°) is optimized to concentrate magnetic flux at the tip while maintaining adequate body cross-section for flux generation. This local geometric differentiation allows the pole to achieve both compact footprint and sufficient magnetic field output.
Solution Approach 2:
The invention specifies precise geometric parameters including a body taper angle of approximately 14.5° and a tip portion perpendicular to the air bearing surface. These parameter optimizations are calculated to balance the magnetic flux concentration effect at the tip with the flux generation capability of the body, resolving the contradiction between size reduction and performance maintenance.
2Volume of moving object
If the write pole is scaled down to increase data storage capacity, then the magnetic area is reduced which compromises overwrite and bit error rate performance
Solution Approach 1:
The write pole is segmented into distinct functional regions: a body portion with optimized cross-section for magnetic flux generation and a tip portion with perpendicular orientation for flux concentration. This segmentation allows each region to be optimized independently - the body provides sufficient volume for flux generation while the tip provides precise geometric control for performance.
Solution Approach 2:
The invention transitions from a uniform cylindrical geometry to a three-dimensional form with a tapered body and perpendicular tip. This dimensional change creates a geometric configuration where the flux path is concentrated at the tip while the body maintains adequate cross-sectional area, effectively decoupling the relationship between overall size and magnetic performance.
Data Source
AI summary
A write pole of a data writer may have at least one rotational milling operation conducted on a write pole blank followed by first and second static milling operations executed at different first and second angles with respect to an air bearing surface. The combination of rotational and static milling operations can form a write pole with body and tip regions defined by a continuous pole sidewall extending perpendicularly from the air bearing surface up to a body taper portion angled at approximately 14.5° with respect to the air bearing surface.