Topological Material Charge Trapping Ferromagnet Switching
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Solution Overview
Problem
Current memory devices can only store one data bit effectively, requiring multiple terminals and complex configurations to store two bits, which limits their efficiency and scalability for applications like neuromorphic computing.
Innovation Solution
A hybrid charge-trap transistor device that uses a topological material positioned between a dielectric and a ferromagnetic material to store two data bits, where one bit is represented by trapped electric charges and the other by the magnetization state of the ferromagnetic material, allowing for efficient storage and reading using a shared topological material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple terminals and complex configurations are used to store two data bits, then storage capacity is improved, but device complexity increases
Solution Approach 1:
The patent combines charge-trap memory and ferromagnetic memory into a single hybrid device structure. The charge-trap layer stores one bit through trapped charges, while the ferromagnetic layer stores another bit through magnetization state, enabling two-bit storage in one device without requiring multiple separate memory terminals or complex configurations.
Solution Approach 2:
The hybrid memory device performs multiple functions within a single structure: it can store data in two different physical states (charge trapping and magnetization), read data through electrical measurements, and potentially integrate logic functions. This multi-functionality allows the device to store two bits without proportionally increasing terminal count or operational complexity.
2Quantity of substance
If multiple terminals are used to store two data bits, then storage capacity is improved, but the number of terminals increases
Solution Approach 1:
The patent merges charge-trap memory and ferromagnetic memory into a single hybrid device structure. The charge-trap layer stores one bit through trapped charges, while the ferromagnetic layer stores another bit through magnetization state, enabling two-bit storage in one device without requiring multiple separate memory terminals or complex configurations.
3Ease of manufacture
If conventional memory structures are used, then manufacturing process is simple, but storage efficiency is limited
Solution Approach 1:
The patent employs a composite structure combining a dielectric charge-trap layer with a ferromagnetic layer. This composite material approach enables the device to leverage both charge trapping and magnetization phenomena, achieving higher storage efficiency (two bits per device) while maintaining compatibility with existing semiconductor manufacturing processes through layer-by-layer fabrication.
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
Enables the storage of two data bits in a single device with reduced terminal count and complexity, improving efficiency and scalability for neuromorphic computing applications by leveraging the properties of topological materials for charge trapping and spin current generation.
Implementation Method 1
The device is configured to switch a magnetization state of the ferromagnetic material based on a current through the topological material
Implementation Method 2
The device is configured to trap electric charge inside the dielectric material or at an interface of the dielectric material and the topological material
Data Source
AI summary
In some examples, a device includes a dielectric material, a ferromagnetic material, and a topological material positioned between the dielectric material and the ferromagnetic material. The device is configured to trap electric charge inside the dielectric material or at an interface of the dielectric material and the topological material. The device is configured to switch a magnetization state of the ferromagnetic material based on a current through the topological material or based on a voltage in the topological material.