Spintronics Interface Gradient Layer for Low-Energy Spin Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spin current generation technologies are limited by the need for rare materials with high atomic numbers, such as platinum, and result in high energy consumption and heat generation due to the use of oxides with low electrical conductance.
Innovation Solution
A spintronics device is developed that includes a metal layer, a semiconductor layer with lower carrier mobility or conductivity, and a gradient layer at their interface. This configuration generates a spin current through the rotation of the electron velocity field caused by the gradient in carrier mobility or conductivity, without requiring rare materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional spin current generation using spin-orbit interaction in rare metals is used, then spin current can be generated, but the selection of materials is excessively limited and energy consumption increases
Solution Approach 1:
The invention changes the fundamental mechanism from spin-orbit interaction to spin-vorticity coupling by creating a gradient in carrier mobility or electrical conductivity. This parameter change allows the use of abundant materials like copper and copper oxide instead of rare metals, expanding material selection flexibility while reducing energy consumption associated with rare material processing and device operation
Solution Approach 2:
The invention uses composite material structures including a first conductive layer (copper), a second conductive layer (copper oxide), and an intermediate layer with gradient composition. This composite structure enables the spin current generation mechanism to work with abundant materials while maintaining efficient spin current intensity comparable to or exceeding conventional rare metal-based devices
2Object-generated harmful factors
If oxide materials are used for the second conductive layer, then spin current can be generated, but electrical conductance decreases and Joule heat increases
Solution Approach 1:
The invention applies local quality by creating an intermediate layer with gradient composition between the copper and copper oxide layers. This gradient structure locally transitions the material properties, allowing the bulk copper layer to provide high electrical conductance while the copper oxide interface region enables spin current generation, thus reducing overall Joule heat generation while maintaining reliability
Solution Approach 2:
The intermediate layer with gradient carrier mobility or electrical conductivity acts as a mediator between the high-conductance copper layer and the spin-active copper oxide layer. This intermediary structure allows efficient charge transport through the copper layer while enabling spin current generation at the interface, reducing Joule heat generation compared to direct copper oxide usage
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 device achieves a large spin current intensity comparable to or exceeding that based on spin-orbit interaction, while reducing energy consumption and heat generation, and allowing for the use of abundant materials like aluminum and silicon.
Implementation Method 1
a spin current is generated by a rotation of an electron velocity field caused by the gradient
Implementation Method 2
the spin current can exert torques on magnetization more efficiently than an Oersted magnetic field
Data Source
AI summary
A spintronics device is a spintronics device that generates a spin current, the device including: a metal layer; a semiconductor layer having a lower carrier mobility or a lower electrical conductivity than the metal layer; and a gradient layer located at a boundary between the metal layer and the semiconductor layer, and having a gradient in the carrier mobility or the electrical conductivity.