Spin Orbit Torque Switching Device Using Chiral Structure
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Solution Overview
Problem
Spin-orbit torque-based switching devices require an external magnetic field for information input, which is a disadvantage, and existing solutions often need additional means to break magnetization symmetry.
Innovation Solution
A spin-orbit torque-based switching device with a heavy metal input terminal and a ferromagnetic information terminal, where magnetization reversal is controlled by a non-uniform spin-orbit torque effect and a chiral spin structure generated due to an input current, without the need for an external magnetic field or additional symmetry-breaking means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external magnetic field is applied for spin-orbit torque-based information input, then magnetization reversal can be achieved, but the device complexity and operational requirements increase
Solution Approach 1:
The patent extracts and eliminates the external magnetic field component from the spin-orbit torque-based information input system. By removing the magnetic field application mechanism and relying solely on spin-orbit torque generated by current flow through the heavy metal layer, the device complexity is reduced while maintaining magnetization reversal capability through the perpendicular magnetic anisotropy of the ferromagnetic layer
Solution Approach 2:
The device utilizes the inherent spin Hall effect of the heavy metal layer to generate the necessary spin-orbit torque for magnetization reversal. The system serves itself by using the current flow through the heavy metal layer to automatically generate the torque needed for switching, without requiring external magnetic field assistance or additional symmetry-breaking mechanisms
2Ease of operation
If additional means are added to break magnetization symmetry for non-magnetic field operation, then magnetization reversal without external field is achieved, but the device complexity increases
Solution Approach 1:
The patent inherently utilizes the asymmetry provided by the perpendicular magnetic anisotropy in the ferromagnetic layer and the spin Hall effect in the heavy metal layer. This natural asymmetry in the material properties and layer configuration enables non-magnetic field operation without requiring additional symmetry-breaking components or mechanisms
Solution Approach 2:
The device structure itself provides the necessary symmetry-breaking through the perpendicular magnetization configuration and spin-orbit coupling. The heavy metal/ferromagnetic layer combination automatically generates the required asymmetric spin torque distribution, eliminating the need for external symmetry-breaking means
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 magnetization reversal using only an input current, eliminating the need for an external magnetic field and additional symmetry-breaking methods, and achieving non-magnetic field magnetization reversal through a chiral spin structure.
Implementation Method 1
spin orbit torque-based switching device
Implementation Method 2
non-uniform spin orbit torque effect (spin Hall effect: SHE)
Implementation Method 3
chiral spin structure inevitably generated in a ferromagnetic layer due to an input current
Data Source
AI summary
The present invention pertains to: a switching device based on spin-orbit torque; and a method for manufacturing same. A switching device based on spin-orbit torque according to an embodiment comprises: a heavy metal input terminal extending in a first direction; and an information terminal extending in a second direction perpendicular to the first direction on the heavy metal input terminal and having a ferromagnetic layer, wherein the information terminal includes a first region adjacent to the heavy metal input terminal and a second region not adjacent to the heavy metal input terminal, and magnetization reversal of the ferromagnetic layer can be controlled on the basis of a non-uniform spin Hall effect (SHE) caused by the first region and the second region.