Recessed Write Transducer Pole for Tape Shingling
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Solution Overview
Problem
The development of small footprint, higher performance tape drive systems for magnetic tape storage has created challenges in designing tape head assemblies, particularly in achieving sharp transitions and high track and linear bit density due to the need for precise magnetic field control and reduced spacing between the tape head and magnetic tape.
Innovation Solution
The design incorporates an array of write transducers with specific magnetic pole piece configurations, including recessed portions and high moment layers, to minimize fringing fields and improve shingled track edges, allowing for sharper transitions and increased data density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spacing between the tape head and magnetic tape is reduced to minimize fringing fields, then track density and transition sharpness are improved, but the manufacturing precision and assembly tolerance requirements increase significantly
Solution Approach 1:
The pole pieces are designed with non-uniform geometry, featuring rounded leading edges and tapered trailing edges. This local variation in shape creates a controlled magnetic field distribution that reduces fringing fields at critical interfaces, allowing for high track density without proportionally increasing assembly tolerance requirements throughout the entire head structure.
Solution Approach 2:
The patent modifies the geometric parameters of the pole pieces, specifically the edge radii and taper angles, to optimize magnetic field confinement. By changing these dimensional parameters, the system achieves improved track density and transition sharpness while maintaining practical assembly tolerances through controlled field distribution rather than relying solely on minimal spacing.
2Measurement precision
If the pole piece geometry is optimized to reduce fringing fields, then transition sharpness and sensing characteristics are improved, but the device complexity increases due to additional geometric constraints
Solution Approach 1:
Different regions of the pole pieces are given different geometric characteristics: leading edges are rounded to concentrate flux at the interface for sharp transitions, while trailing edges are tapered to reduce fringing fields. This localized differentiation improves sensing characteristics without requiring complex geometry throughout the entire pole piece structure.
Solution Approach 2:
The leading edges of the pole pieces are designed with rounded geometries rather than sharp corners. This curvature concentrates the magnetic flux at the pole-face interface, improving transition sharpness and sensing characteristics while avoiding the need for excessively complex geometric constraints to control field distribution.
3Manufacturing precision
If the tape head is designed for near contact with the tape to achieve sharp transitions, then data storage density is improved, but the reliability decreases due to increased wear and contamination risks
Solution Approach 1:
The pole pieces are designed with specific local geometric features: rounded leading edges that concentrate flux for sharp transitions at minimal spacing, and tapered trailing edges that reduce fringing fields. This localized optimization allows near-contact operation for high density while the controlled field distribution reduces stress concentrations that would otherwise accelerate wear.
Solution Approach 2:
Rounded leading edges on the pole pieces distribute contact stresses more uniformly compared to sharp corners, reducing localized wear while maintaining the near-contact spacing necessary for high data storage density. The curvature also helps in maintaining stable magnetic coupling without requiring perfectly rigid positioning.
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 enhances data storage density by achieving sharper transitions and reducing side writing distortions, thereby improving the sensing characteristics and efficiency of the tape/head system.
Implementation Method 1
The magnetic recording transducer then generates a magnetic field, which encodes the data into the magnetic media
Implementation Method 2
a lower high moment layer above the lower base layer and in magnetic communication therewith
Data Source
AI summary
An apparatus includes an array of write transducers. Each write transducer includes a lower yoke, a lower write pole piece comprising a lower base layer in magnetic communication with the lower yoke and a lower high moment layer above the lower base layer. Each write transducer includes a write gap above the lower write pole piece and an upper write pole piece above the write gap. The upper write pole piece includes an upper high moment layer above the write gap and an upper base layer above the upper high moment layer. Each write transducer includes an upper yoke above the upper base layer. A media facing side of the lower pole piece and at least a portion of a media facing side of the upper pole piece extend along a plane and the remainder of the media facing side of the upper pole piece is recessed from the plane.