Magnetic Recording Transducer Middle Shield Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Two-dimensional magnetic recording (TDMR) transducers face misalignment issues due to skew angles and radius conditions, which can be exacerbated by reduced separation between sensors, leading to capacitive coupling noise and crosstalk.
Innovation Solution
The configuration of read sensors and shields in the transducer includes conductive magnetic middle shield layers separated by insulating layers to provide electrical isolation and reduce capacitive coupling, with specific electrical potentials applied to the shields to mitigate noise and improve performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vertical separation between adjacent sensors is reduced to reduce skew angle misalignment, then the misalignment shift is reduced, but capacitive coupling noise and crosstalk increase
Solution Approach 1:
The patent introduces middle shields as intermediary elements positioned between adjacent read sensors. These middle shields act as mediators that provide electrical isolation and reduce capacitive coupling between sensors, enabling the sensors to be placed closer together without increasing crosstalk. The middle shields are connected to a middle shield contact pad that provides a reference potential, further enhancing their isolation function.
Solution Approach 2:
The patent extracts the shielding function from the sensor structure itself and separates it into dedicated middle shield layers. By taking out the isolation function as a separate component, the design allows sensors to be positioned closer together while maintaining electrical isolation through the extracted shielding elements.
2Measurement precision
If multiple sensors are brought closer together to reduce skew angle effects, then alignment accuracy improves, but device complexity increases due to additional shielding requirements
Solution Approach 1:
The patent merges the middle shield function with the existing shield structure by integrating middle shield layers into the transducer stack. The middle shields are formed as continuous layers that span across multiple sensors, combining isolation functions for multiple sensor pairs into a unified structure rather than requiring separate shields for each sensor pair.
Solution Approach 2:
The middle shields serve multiple functions simultaneously: they provide electrical isolation between adjacent sensors, act as magnetic shields, and are connected to a common reference potential through the middle shield contact pad. This multi-functionality reduces the need for separate components for each function.
3Productivity
If sensors are positioned with minimal separation to achieve high density recording, then recording density increases, but crosstalk between sensors worsens
Solution Approach 1:
The middle shields serve as intermediary elements that enable high-density sensor positioning by providing electrical isolation. These shields are positioned between adjacent sensors and connected to a middle shield contact pad, creating an isolation barrier that allows sensors to be placed at minimal separation without increasing crosstalk.
Solution Approach 2:
The middle shield contact pad provides a common reference potential to all middle shields, creating an equipotential region that reduces voltage differences between adjacent sensor structures. This equipotential connection minimizes capacitive coupling and crosstalk, enabling closer sensor spacing for high-density recording.
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 reduces cross-talk and addresses skew issues, enabling higher density recording and improved frequency performance by minimizing the adverse effects of sensor overlap on the magnetic transducer.
Implementation Method 1
the capacitive coupling noise or the crosstalk may become a major concern especially when the vertical separation between adjacent sensors is reduced
Implementation Method 2
conductive magnetic middle shield layers separated by insulating layers to provide electrical isolation and reduce capacitive coupling
Data Source
AI summary
A read transducer having a first read sensor, a second read sensor, and a first middle shield is provided. The second read sensor is disposed in a down track direction from the first read sensor. The first middle shield is disposed between the first read sensor and the second read sensor. The first middle shield includes a first metallic middle shield layer disposed between the first read sensor and the second read sensor, a second metallic middle shield layer disposed between the first metallic middle shield layer and the second read sensor, and a first magnetic-spacer layer disposed between the first metallic middle shield layer and the second metallic middle shield layer. The first metallic middle shield layer and the second metallic middle shield layer have substantially the same polarity.