Spin-Orbitronics Device With Transverse Polarizing Layer
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Solution Overview
Problem
Conventional spin-transfer torque magnetic tunnel junctions (STT-MTJs) are limited in their applications to non-volatile memory due to their inability to switch the magnetic free layer beyond simple read and write functions, and there is a need for a device that can offer additional functionalities at a lower manufacturing cost.
Innovation Solution
A spin-orbitronics device with a magnetic comparison layer structure having a pseudo-invariable magnetization direction, a magnetic free layer structure with a variable magnetization direction switchable by a switching current, and a non-magnetic transverse polarizing layer made of metals or topological insulators, allowing for additional functionalities beyond conventional memory devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional STT-MTJ structure is used, then simple read and write functions are achieved, but additional functionalities cannot be implemented
Solution Approach 1:
The patent applies multi-functionality by enabling the magnetic tunnel junction to perform both conventional memory operations (read/write) and content addressable memory operations through the addition of the transverse polarizing layer. This layer allows the device to switch between different operational modes without requiring completely separate device structures, thus achieving universal functionality.
Solution Approach 2:
The invention segments the magnetic tunnel junction into distinct functional components: the original magnetic free layer and reference layer for basic memory operations, and the added transverse polarizing layer for content addressable operations. This segmentation allows each component to be optimized for its specific function while working together to provide enhanced versatility.
2Adaptability or versatility
If additional functionalities are added to STT-MTJ, then device capabilities are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the content addressable memory functionality directly into the existing magnetic tunnel junction structure by adding the transverse polarizing layer. This integration approach allows multiple functions to be achieved within a single device structure that can be manufactured using conventional semiconductor fabrication processes, avoiding the need for separate devices or complex assembly steps that would increase manufacturing cost.
3Adaptability or versatility
If magnetic free layer is switched beyond simple read and write, then conventional memory limitations are overcome, but device operation becomes more complex
Solution Approach 1:
The transverse polarizing layer acts as an intermediary that mediates between the applied current and the magnetic free layer. It converts the current direction (transverse flow) into magnetization switching (in-plane or perpendicular), providing a clear and intuitive control mechanism that simplifies operation despite the enhanced capabilities.
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 spin-orbitronics device enables switching of both the magnetic free layer and the pseudo-invariable comparison layer, providing dual spin transfer torque and enabling more complex memory operations, such as self-reference and content addressable memory functions, while maintaining low manufacturing costs.
Implementation Method 1
the magnetization direction of the magnetic free layer and thus the resistance state of the MTJ may be switched by a spin-polarized electron flow that exerts a spin transfer torque on the magnetic free layer
Implementation Method 2
A spin-orbitronics device whose operation is effectuated by spin transfer torque (STT) and spin-orbit interaction
Data Source
AI summary
The present invention is directed to a spin-orbitronics device including an array of MTJs with each of the MTJs coupled to a respective one of a plurality of selection transistors; a plurality of transverse polarizing lines with each of the transverse polarizing lines coupled to a row of the MTJs along a first direction; a plurality of word lines with each of the word lines coupled to gates of a row of the selection transistors along a second direction; and a plurality of source lines with each of the source lines coupled to a row of the selection transistors along a direction substantially perpendicular to the second direction. Each MTJ includes a magnetic comparison layer structure having a pseudo-invariable magnetization direction, which is configured to switch between two stable states by passing a comparison current through one of the plurality of transverse polarizing lines formed adjacent to the magnetic comparison layer structure.