Spin Orbit Torque Spintronics Device Magnetization Switching

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Solution Overview

Problem

Current spintronics devices rely on current-induced spin transfer torque (STT) for magnetization control, which is power-intensive and lacks scalability, necessitating the development of high-performance devices utilizing spin-orbit torque (SOT) for efficient and stable magnetization switching.

Innovation Solution

A SOT-based spintronics device comprising a ferromagnetic layer, a metal layer, a spacer layer, and a dielectric layer, where the ferromagnetic layer is sandwiched between the metal and spacer layers, enabling efficient magnetization switching via in-plane currents and orthogonal addressing lines to modulate SOT without requiring external magnetic fields.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If current-induced spin transfer torque (STT) is used for magnetization control, then magnetization switching can be achieved, but power consumption is high and scalability is limited

Engineering Contradiction:

Improvepower consumptionVSAvoidscalability

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent replaces the conventional STT mechanism with spin-orbit torque (SOT) generated through the spin Hall effect in a metal layer adjacent to the ferromagnetic layer. This substitution eliminates the need for current to flow directly through the magnetic tunnel junction, thereby reducing power consumption and enabling better scalability for commercial applications

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If a spin polarizer is used in STT structure, then magnetization switching can be achieved, but device complexity increases

Engineering Contradiction:

Improvemagnetization controlVSAvoidstructure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the spin polarizer component from the conventional STT structure. Instead, magnetization control is achieved through SOT generated in a metal layer adjacent to the ferromagnetic layer, simplifying the overall device structure while maintaining magnetization switching capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a metal layer with high spin Hall angle as an intermediary to generate spin-orbit torque. This metal layer acts as a mediator that converts charge current into spin current, which then acts on the ferromagnetic layer to achieve magnetization switching without requiring a spin polarizer

Inventive Principle:

Principle #24Intermediary (Mediator)

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 SOT-based spintronics device achieves efficient, low-power magnetization switching with enhanced stability and scalability, suitable for commercial applications such as magnetic logic devices and non-volatile memories, by utilizing the spin Hall effect and dielectric materials to modulate SOT effectively.

Implementation Method 1

utilizing the spin Hall effect and dielectric materials to modulate SOT effectively

Methodology Applied

Scientific EffectSpin Hall Effect: Hall Effect

Implementation Method 2

enabling efficient magnetization switching via in-plane currents and orthogonal addressing lines to modulate SOT

Methodology Applied

Scientific EffectSpin-Orbit Torque:

Data Source

PatentUS9741414B2Spin orbit and spin transfer torque-based spintronics devices

Publication Date: 2017.08.22 NATIONAL UNIVERSITY OF SINGAPORE

AI summary

A spin orbit torque-based spintronics device that includes a ferromagnet layer having a first surface and a second surface opposed to each other, a metal layer and a spacer layer covering the first surface and the second surface of the ferromagnet layer, respectively, and an dielectric layer covering either the metal layer or the spacer layer. Also disclosed are two related spin orbit torque-based spintronics devices and methods of using these three spintronics devices.