Resonant Tunnel Data Reader for High Density Storage
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Solution Overview
Problem
Data storage devices face challenges in maintaining high data bit density while minimizing data access errors due to insufficient sensitivity in distinguishing between closely positioned data bits, leading to increased data access errors and reduced performance.
Innovation Solution
A resonant tunnel structure is employed in a data reader, comprising a spacer layer between first and second magnetic barrier layers of different thicknesses, optimizing resonant tunnel magnetoresistance (TMR) through quantum confined electronic states, allowing for tunable conductance and resistance area products via voltage regulation, thereby enhancing data reading sensitivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data bit density is increased to accommodate greater data capacity, then data storage capacity is improved, but data access errors increase due to insufficient sensitivity in distinguishing between closely positioned data bits
Solution Approach 1:
The patent changes the physical parameters of the tunnel barrier layer by introducing a resonant tunnel structure with specific thickness (5-15 Å) and composition (MgAlO, MgZnO, or (Mg,Al)ZnO). This parameter optimization enables the reader to achieve sufficient sensitivity for distinguishing closely positioned data bits while maintaining high data storage capacity
Solution Approach 2:
The patent employs composite material structures including MgO barrier layers combined with resonant tunnel barriers of MgAlO, MgZnO, or (Mg,Al)ZnO. These composite structures leverage the beneficial properties of each material to achieve both high TMR ratios for sensitivity and appropriate resistance area products for reliable data access at high bit densities
2Measurement precision
If shield-to-shield spacing is reduced to increase data bit linear resolution, then measurement precision is improved, but device stability deteriorates
Solution Approach 1:
The patent optimizes the resistance area product parameter by controlling the tunnel barrier layer thickness and material composition. This parameter tuning allows the reader to achieve high data bit linear resolution with reduced shield-to-shield spacing while maintaining operational stability through optimized electrical characteristics
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 resonant tunnel structure increases data reader stability and performance by maximizing TMR and current transmission, balancing data bit linear resolution with reduced shield-to-shield spacing, thus improving data storage device capabilities.
Implementation Method 1
A data reader, in accordance with some embodiments, has resonant tunneling by employing an resonant tunnel structure disposed between first and second magnetic structures
Implementation Method 2
optimizing resonant tunnel magnetoresistance (TMR) through quantum confined electronic states
Data Source
AI summary
A data reader may have an resonant tunnel structure disposed between first and second magnetic structures. The resonant tunnel structure can be configured with a spacer layer disposed between first and second barrier layers. The first barrier layer can have a first thickness that is smaller than a second thickness of the second barrier layers with the thicknesses each measured along a common plane to provide resonant tunneling for the data reader.