Spin Rotary Member Using Spin-Transfer Torque
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Solution Overview
Problem
Existing nanoscale motors face challenges in downsizing due to complex assembly requirements and need for special electrode structures to drive the rotor, making them difficult to manufacture and maintain.
Innovation Solution
A spin rotary member comprising a ferromagnetic spin injector, a disk-like ferromagnetic spin rotor, a non-magnetic channel part, and a spin rotation control part, which uses spin-transfer torque and controlled spin currents to rotate the magnetic moment of the spin rotor, allowing for a simpler motor structure and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electromagnetic induction motors are used, then motor function is achieved, but manufacturing complexity increases due to coil assembly requirements
Solution Approach 1:
The patent replaces the electromagnetic induction system (coils and magnets) with a spin-transfer torque system using ferromagnetic materials and spin-polarized current. This substitution eliminates the need for complex coil assemblies and mechanical rotor structures, achieving motor function through magnetic moment manipulation instead of electromagnetic forces
Solution Approach 2:
The invention extracts and removes the complex coil assembly components from the motor structure. By using a spin injector to generate spin-polarized current that flows through a non-magnetic channel to exert torque on the spin rotor, the patent eliminates the need for surrounding coils while maintaining motor functionality
2Ease of manufacture
If gyromagnetic effect motors are used, then motor function is achieved, but structural complexity increases due to electrode coupling requirements
Solution Approach 1:
The patent replaces the gyromagnetic effect mechanism requiring electrode coupling with a spin-transfer torque mechanism. By using a spin injector to generate spin-polarized electrons that flow through a channel to exert torque on the rotor, the invention eliminates the need for complex electrode structures while achieving rotational motion
3Length of moving object
If motor downsizing is pursued, then miniaturization is achieved, but assembly difficulty increases
Solution Approach 1:
The patent merges the spin injector, channel, and rotor into a vertically stacked integrated structure. The spin injector is positioned below the channel, which connects to the rotor above, creating a compact three-layer configuration that reduces overall motor size while simplifying assembly through vertical integration rather than horizontal arrangement
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 creation of a nanoscale motor with a simple structure that can be easily manufactured and operated, reducing the need for complex coil arrangements and electrode connections, while efficiently controlling the magnetic moment and kinetic energy conversion.
Implementation Method 1
when a current or a voltage is applied to the spin injector made of a ferromagnetic material and the channel part made of a non-magnetic material, for example, a spin current is caused in the channel part toward the spin rotor made of a ferromagnetic material. Spin flowing in the channel part functions as a spin-transfer torque with respect to the magnetic moment of the spin rotor
Data Source
AI summary
A spin rotary member includes a substrate, a spin injector made of a ferromagnetic material magnetized in a substrate in-plane direction, and provided on the substrate, a spin rotor made of a ferromagnetic material having a magnetic moment rotatable in the substrate in-plane direction, and provided on the substrate, being separated from the spin injector, a channel part made of a non-magnetic material, arranged between the spin injector and the spin rotor, and bonded with the spin injector and the spin rotor directly or through an insulating layer, and a spin rotation control part configured to control a rotation direction of spin of the channel part.