Tunnel Magnetoresistive Sensor Spacer Layer Design
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Solution Overview
Problem
Current magnetic tape data storage systems face challenges in maintaining effective contact between the tape head and the magnetic tape, leading to issues such as electrical shorting and reduced sensor sensitivity due to the thin insulating barrier layers in CPP sensors like TMR sensors, which are prone to deformation and smearing by tape asperities.
Innovation Solution
Incorporating novel spacer layers with higher resistance and durability, such as aluminum oxide, between the electrical lead layers and the shields in the CPP sensor structure to prevent shorting and maintain effective current flow, while also ensuring magnetic shielding and improved signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thin insulating barrier layers are used in CPP sensors to improve sensitivity, then sensor sensitivity is improved, but electrical shorting increases due to deformation and smearing by tape asperities
Solution Approach 1:
A durable spacer layer is introduced as an intermediary component between the electrical lead layer and the shield. This spacer layer has higher resistance and durability characteristics that prevent electrical shorting while allowing the thin insulating barrier layer in the sensor to maintain high sensitivity. The spacer acts as a protective mediator that resists deformation from tape asperities.
Solution Approach 2:
The patent applies different material properties to different regions of the tape head structure. The spacer layer is specifically designed with higher resistance and durability characteristics localized at the interface between the electrical lead layer and the shield, while the sensor's insulating barrier layer maintains its thin, high-sensitivity characteristics in the sensing region.
2Reliability
If spacer layers with higher resistance are incorporated to prevent shorting, then reliability is improved, but device complexity increases
Solution Approach 1:
The tape head structure is segmented into distinct functional layers: the sensor layer with thin insulating barrier, the electrical lead layer, and the spacer layer with higher resistance. This segmentation allows each layer to be optimized for its specific function while maintaining overall structural organization and manufacturability.
Solution Approach 2:
The patent employs composite material structure where the spacer layer is made from materials with higher resistance and durability characteristics compared to the sensor's insulating barrier layer. This composite approach combines materials with different properties to achieve both high sensitivity and shorting resistance.
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 implementation of spacer layers reduces the likelihood of electrical shorting and enhances the sensitivity and durability of CPP sensors, particularly in tape heads, by maintaining uniform current flow and resisting deformation from tape asperities, thus improving the overall performance and reliability of magnetic tape data storage systems.
Implementation Method 1
resisting deformation from tape asperities
Implementation Method 2
electrical lead layer is in electrical communication with the sensor
Implementation Method 3
The upper and lower shields provide magnetic shielding
Implementation Method 4
current-perpendicular-to-plane sensor between the upper and lower shields
Data Source
AI summary
An apparatus, according to one embodiment, includes: a transducer structure having: a lower shield, an upper shield above the lower shield, a current-perpendicular-to-plane sensor between the upper and lower shields, an electrical lead layer between the sensor and one of the shields, and a spacer layer between the electrical lead layer and the one of the shields. The upper and lower shields provide magnetic shielding. The electrical lead layer is in electrical communication with the sensor. A conductivity of the electrical lead layer is higher than a conductivity of the spacer layer. A width of the electrical lead layer in a cross-track direction is greater than the width of a free layer of the sensor.