Conductive Vias for Magnetic Sensor Array Electrical Connectivity
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Solution Overview
Problem
Conventional magnetic recording transducers face challenges in achieving adequate performance at higher recording densities, particularly due to skew angle variations and electrical connection issues, which affect the alignment and noise cancellation capabilities of read sensors in two-dimensional magnetic recording (TDMR) technology.
Innovation Solution
The design incorporates multiple read sensors with varying widths and distances, aligned in the cross-track direction, and conductive vias with corner-free shapes to reduce contact resistance and improve electrical connectivity, addressing skew issues and enabling efficient noise cancellation at high track densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple read sensors are used in TDMR to achieve higher recording densities, then recording density is improved, but electrical connection difficulty increases
Solution Approach 1:
The patent introduces conductive vias as intermediary elements to establish electrical connections between the multiple read sensors and the read circuitry. These vias act as mediators that bridge the gap between sensors positioned at different locations (including outer sensors in TDMR configurations) and the signal processing circuitry, thereby enabling electrical connectivity without direct contact between all sensor pairs.
Solution Approach 2:
The patent transitions from planar electrical connections to three-dimensional vertical connections by routing signals through conductive vias that extend perpendicular to the sensor array plane. This dimensional change allows multiple sensors to be connected to read circuitry located on different layers or positions, facilitating TDMR configurations where sensors are distributed across multiple tracks.
2Reliability
If outer read sensors are positioned to sense adjacent tracks for noise cancellation, then noise cancellation capability is improved, but skew alignment performance deteriorates
Solution Approach 1:
The patent implements adjustable and reconfigurable sensor positioning mechanisms that allow the read head to dynamically adjust the positions of outer sensors relative to the central sensor. This dynamic adjustment enables the system to optimize sensor alignment for different skew conditions while maintaining the noise cancellation benefit of having sensors on adjacent tracks. The sensor array can be reconfigured based on the detected skew angle to maintain optimal performance.
Solution Approach 2:
The patent employs variable geometric parameters for the sensor array, including adjustable sensor widths, spacing distances, and lateral positions. By changing these parameters dynamically or providing multiple configurations, the system can optimize both the noise cancellation capability (requiring sensors on adjacent tracks) and skew alignment performance (requiring proper alignment with the track center) depending on operating conditions.
3Ease of manufacture
If conventional transducer design is used, then manufacturing simplicity is maintained, but performance at higher recording densities deteriorates
Solution Approach 1:
The patent divides the read head into multiple independent sensor elements (central sensor and outer sensors) that can be separately optimized and positioned. This segmentation allows each sensor to be tailored for specific functions: the central sensor for primary data reading and outer sensors for noise cancellation. The segmented design maintains manufacturing simplicity through modular fabrication processes while achieving superior performance at higher recording densities through the coordinated operation of multiple sensors.
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 the performance of magnetic recording transducers by reducing contact resistance and improving data reading accuracy at higher recording densities, particularly beneficial for TDMR applications.
Implementation Method 1
conductive vias with corner-free shapes to reduce contact resistance and improve electrical connectivity
Implementation Method 2
The read sensor 14 is typically a giant magnetoresistive (GMR) sensor or tunneling magnetoresistive (TMR) sensor
Implementation Method 3
The read sensor 14 is typically a giant magnetoresistive (GMR) sensor or tunneling magnetoresistive (TMR) sensor
Implementation Method 4
The magnetic bias structures 16 may be hard bias structures or soft bias structures 16. These magnetic bias structures are used to magnetically bias the sensor layer of the sensor 14
Data Source
AI summary
A method and system provide a magnetic transducer including first and second read sensors, a shield and a conductive via. The shield is between the first and second read sensors. In one aspect, the magnetic transducer also includes first and second read shields. In this aspect, the first read shield has a read shield aperture. The conductive via extends through the read shield aperture, provides electrical contact to the shield and is insulated from the first read shield. In another aspect, the shield has first and second shield layers separated by an insulating layer. In this aspect, the second shield layer has an aperture therein. The conductive via extends through this aperture, provides electrical contact to the first shield layer and is insulated from the second shield layer.