Magnetic Head Sensor Spacer Structures for Track Width Narrowing
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Solution Overview
Problem
Conventional magnetic head sensors face limitations in miniaturization, leading to overlapping tracks and signal distortion due to large sensor structures and tall profiles, which hinder recording density and data reading efficiency.
Innovation Solution
The development of magnetic heads with improved sensor structures featuring reduced width, narrower cross-sectional profiles, and more vertical sidewalls, along with a method involving a polymer mask with low line edge roughness, conformal deposition, and subtractive processes to form the sensor structures, allowing for precise and efficient read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sensor structures are used, then manufacturing is easier, but sensor width is too large causing track overlap and signal distortion
Solution Approach 1:
The patent introduces a spacer structure that extends vertically from the air bearing surface, adding a height dimension to the sensor structure. This vertical extension allows the sensor to read data from multiple depths, improving signal quality while maintaining a narrow horizontal footprint to prevent track overlap. The spacer height is specifically designed to be between 0.5-2.0 micrometers to optimize this effect.
Solution Approach 2:
The sensor structure is divided into distinct functional segments: a base sensor portion and a vertically extending spacer portion. This segmentation allows each part to perform its specific function - the base sensor reads data while the spacer extends the reading depth and narrows the effective track width, preventing overlap with adjacent tracks.
2Productivity
If conventional sensor structures with tall profiles are used, then manufacturing is simpler, but transition times are too long reducing reading efficiency
Solution Approach 1:
By extending the sensor structure vertically through the spacer, the patent enables simultaneous reading from multiple depths within the magnetic medium. This reduces the time needed to accumulate sufficient signal data, thereby decreasing transition times and improving reading efficiency without requiring a wider sensor structure.
3Reliability
If larger sensor structures are used, then signal strength is stronger, but adjacent tracks overlap causing noise and distortion
Solution Approach 1:
The vertical spacer extension allows the sensor to read data from multiple depths, accumulating signal strength through depth integration rather than width expansion. This maintains narrow horizontal dimensions to prevent track overlap while achieving strong signals through the extended reading depth of the spacer structure.
Solution Approach 2:
The sensor structure combines different materials with complementary properties: conductive materials for the base sensor to detect magnetic signals, and insulating or semi-conductive materials for the spacer to provide structural extension while controlling electrical properties. This composite approach optimizes both signal quality and geometric precision.
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 improved sensor structures enable sharper transitions and reduced noise during data reading, enhancing recording density and overall performance by minimizing interference between adjacent tracks.
Implementation Method 1
depositing a spacer film above the polymer mask and exposed portions of the substrate using a conformal deposition process
Data Source
AI summary
A magnetic head, according to one embodiment, includes a sensor structure extending from an air bearing surface end thereof in a stripe height direction, the sensor structure having sidewalls on opposite sides thereof, the sidewalls extending between a top and a bottom of the sensor structure, the sidewalls extending in the stripe height direction, wherein a spacing between the sidewalls in a track width direction along the top of the sensor structure is about constant therealong in the stripe height direction.