Spin Field Effect Logic Devices for Low Power Integration
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Solution Overview
Problem
As semiconductor devices are fabricated at a nano-scale, carrier mobility fails to keep pace with device integration, leading to increased power consumption despite reduced device size, necessitating the development of more efficient logic devices.
Innovation Solution
The implementation of spin field effect logic devices using a channel with magnetic materials to selectively transmit spin-polarized electrons, controlled by a gate electrode, with tunnel barriers and ferromagnetic layers to manage magnetization states and resistance, enabling the creation of inverter, NAND, AND, and NOR logic circuits with improved speed and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transistors are used for logic circuits, then device integration can be increased, but power consumption increases and carrier mobility cannot keep pace with integration degree
Solution Approach 1:
The patent replaces conventional charge-based transistor operation with spin-based electron transmission. The spin field effect logic device uses spin-polarized electrons transmitted through a magnetic channel under gate control, substituting the mechanical/electrical charge manipulation of conventional transistors with quantum spin effect manipulation, thereby reducing power consumption while maintaining high integration capability
2Productivity
If conventional transistors are used for logic circuits, then device integration can be increased, but carrier mobility cannot keep pace with the degree of device integration
Solution Approach 1:
The patent changes the fundamental operating parameter from charge-based to spin-based electron transmission. By utilizing spin-polarized electrons and magnetic field effects in the channel, the device achieves higher carrier mobility that keeps pace with device integration, as spin effects are less susceptible to scattering and degradation at nano-scales compared to charge-based mechanisms
3Adaptability or versatility
If logic circuits use conventional transistor structures, then functionality can be achieved, but the structure becomes complex and requires a large number of transistors
Solution Approach 1:
The patent creates a universal spin field effect logic device structure that can perform multiple logic functions (inverter, NAND, AND, NOR) by configuring magnetic materials and gate electrodes in different patterns. This multi-functional approach reduces the need for separate transistor structures for each logic gate, thereby simplifying overall circuit complexity while maintaining full logic functionality
Solution Approach 2:
The patent merges the channel, magnetic materials, and gate electrode into an integrated spin field effect device structure. By combining these elements into a unified device that directly performs logic operations through spin effects, the patent eliminates the need for separate transistor interconnections and control circuits required in conventional logic gate implementations
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
These devices operate at faster speeds and consume less power while maintaining a simple configuration, effectively addressing the limitations of conventional logic circuits by leveraging spin-polarized electron transmission and magnetization control.
Implementation Method 1
a channel including a magnetic material configured to selectively transmit spin-polarized electrons
Implementation Method 2
the gate electrode may be configured to control a magnetization state of the channel in order to selectively transmit electrons injected from the source into the channel
Implementation Method 3
The logic device may further include a tunnel barrier on the channel
Implementation Method 4
the drain and the output electrode may include a magnetic material, wherein the drain may be magnetized in a second direction and the output electrode may be magnetized in the first direction
Data Source
AI summary
Provided are spin field effect logic devices, the logic devices including: a gate electrode; a channel formed of a magnetic material above the gate electrode to selectively transmit spin-polarized electrons; a source on the channel; and a drain and an output electrode on the channel outputting electrons transmitted from the source. The gate electrode may control a magnetization state of the channel in order to selectively transmit the electrons injected from the source to the channel.