Magnetic Domain Wall Element Structure for Stable Domain Movement
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Solution Overview
Problem
The operation of magnetic domain wall movement elements is unstable due to impurities and defects in the magnetic domain wall movement layer, leading to trapping of the magnetic domain and malfunctions.
Innovation Solution
A magnetic domain wall movement element is designed with a laminate structure including a ferromagnetic layer, a non-magnetic layer, and a magnetic domain wall movement layer, where a first surface layer with higher resistivity than the magnetic domain wall movement layer is used to stabilize the operation, and an insulating layer contacts the upper surface of the first surface layer to prevent impurity formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic domain wall movement layer is used to record data, then data storage capability is improved, but impurities and defects in the layer cause magnetic domain trapping and operational instability
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first conductive layer and the magnetic domain wall movement layer. This insulating layer prevents direct contact that would otherwise allow impurity formation and domain trapping at the interface, thereby stabilizing magnetic domain operation while maintaining data storage functionality.
Solution Approach 2:
The harmful interface between the conductive layer and magnetic domain wall movement layer is separated by extracting the direct contact and replacing it with an insulating barrier. This removes the source of impurity formation and domain trapping, eliminating the harmful effect while preserving the essential magnetic domain movement capability.
2Ease of manufacture
If the magnetic domain wall movement layer contacts conductive layers directly, then electrical connection is improved, but impurity formation and domain trapping increase
Solution Approach 1:
The insulating layer serves as a mediator that maintains electrical isolation while allowing controlled current flow through the magnetic domain wall movement layer via spin transfer torque. This intermediary structure prevents direct impurity formation at the interface while still enabling the necessary electrical control for domain wall movement.
Solution Approach 2:
The insulating layer is applied selectively at specific interfaces where impurity formation occurs, rather than throughout the entire structure. This localized application maintains electrical connection quality in regions where it is needed while preventing domain trapping only at the critical interface regions.
3Ease of manufacture
If impurities and defects are present in the magnetic domain wall movement layer, then manufacturing simplicity is maintained, but magnetic domain trapping and operational instability occur
Solution Approach 1:
The insulating layer acts as a protective intermediary that prevents impurity formation at the interface during standard manufacturing processes. By placing this barrier layer, conventional fabrication methods can be used without introducing harmful impurities that would otherwise trap magnetic domains and cause operational instability.
Solution Approach 2:
The insulating layer is formed in advance before subsequent manufacturing steps that could introduce impurities. This preliminary protective action prevents contamination and defect formation at the interface, ensuring stable magnetic domain operation without requiring complex post-processing to remove impurities.
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 solution stabilizes the operation of the magnetic domain wall, preventing erroneous writing and improving the reliability of the magnetic domain wall movement element by suppressing the formation of trap factors and maintaining a stable magnetic bond between layers.
Implementation Method 1
the resistivity of the first surface layer is higher than the resistivity of the magnetic domain wall movement layer
Implementation Method 2
a magnetic domain wall movement element capable of recording data in multiple values or digital values by moving a magnetic domain in a magnetic domain wall movement layer
Data Source
AI summary
A magnetic domain wall movement element includes: a laminate including a ferromagnetic layer, a non-magnetic layer, and a magnetic domain wall movement layer; a first conductive layer; and a first surface layer laminated above a substrate in order from the substrate, wherein the non-magnetic layer is sandwiched between the ferromagnetic layer and the magnetic domain wall movement layer, wherein the first conductive layer is connected to an upper surface of the magnetic domain wall movement layer, wherein the first surface layer contacts at least a part of an upper surface of the magnetic domain wall movement layer, and wherein the resistivity of the first surface layer is higher than the resistivity of the magnetic domain wall movement layer.