Adaptive Read Sensor Track Width for Magnetic Transducers
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Solution Overview
Problem
Conventional magnetic recording read transducers face performance issues due to changes in write track width, which they fail to adapt to, leading to suboptimal performance in magnetic recording technology.
Innovation Solution
A magnetic read transducer design with an adaptive track width, where the width changes along the stripe height direction to match the varying write track width, incorporating a read sensor with different widths at the air-bearing surface and recessed from it, and a read sensor angle corresponding to the writer nose chisel angle, enhancing on-track performance and compatibility with current fabrication techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the read transducer uses a conventional fixed track width design, then the manufacturing is simple, but the adaptability to varying write track widths deteriorates
Solution Approach 1:
The read sensor track width is made variable along the stripe height direction rather than fixed. The track width changes from a first width at the air-bearing surface to a second width recessed from the air-bearing surface, allowing the read transducer to adapt to different write track widths dynamically along the stripe height direction.
Solution Approach 2:
Different portions of the read sensor have different track widths tailored to specific functions. The portion at the air-bearing surface has a narrower width optimized for on-track performance, while the recessed portion has a wider width that provides adaptability to write track width variations.
2Adaptability or versatility
If the read sensor track width is increased to match varying write track widths, then the adaptability improves, but the on-track performance deteriorates
Solution Approach 1:
The read sensor track width varies dynamically along the stripe height direction. At the air-bearing surface where on-track performance is critical, the track width is narrow. As the sensor extends recessed from the air-bearing surface, the track width increases to provide adaptability to write track width variations.
Solution Approach 2:
Different sections of the read sensor are optimized for different performance requirements. The section at the air-bearing surface has narrow track width for precise on-track measurement, while the recessed section has wider track width for adaptability to write track width changes.
3Reliability
If the read transducer is updated to account for write track width changes, then the performance improves, but the device complexity increases
Solution Approach 1:
Rather than requiring complex updates to the read transducer design, the solution implements a variable track width profile along the stripe height direction. This dynamic width variation inherently accounts for write track width changes and improves read performance without requiring complex control systems or multiple transducer configurations.
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
The adaptive track width design improves on-track performance by enhancing error margin, signal-to-noise ratio, and reducing adjacent track interference, while being compatible with existing fabrication methods without significant complexity.
Implementation Method 1
the free layer 28 magnetic moment has a direction that is based on the field from the media. Based on the orientations of the magnetic moment of the free layer 28, the magnetoresistance of the conventional read sensor 20 changes.
Data Source
AI summary
A method and system provide a magnetic read transducer having an air-bearing surface (ABS). The magnetic transducer includes a first shield, a second shield, and a read sensor between the first shield and the second shield. The read sensor extends along a stripe height direction perpendicular to the ABS. A first portion of the read sensor at the ABS has a first width in a track width direction parallel to the ABS. A second portion of the read sensor is recessed from the ABS along the stripe height direction and has a second width in the track width direction. The second width is greater than the first width.