Magnetic Memory Domain Wall Shifting via Asymmetric Constriction
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Solution Overview
Problem
Current magnetic memory technologies face challenges in accurately shifting domain walls within magnetic members due to asymmetry in projection and concave portions, leading to errors in data storage and retrieval.
Innovation Solution
A magnetic memory design with a constriction structure featuring projection and concave portions of varying dimensions, utilizing a shift pulse with two distinct current values to stabilize and move domain walls in a controlled manner, reducing shift errors by stabilizing the domain wall in the concave portion after the shift operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional magnetic memory structure with uniform projection and concave portions is used, then the structure is simple to manufacture, but domain wall shifting accuracy deteriorates due to asymmetry errors
Solution Approach 1:
The patent applies asymmetry by designing the magnetic member with projection portions and concave portions having intentionally different dimensions. Specifically, the concave portions have smaller dimensions than the projection portions, creating an asymmetric structure that enables accurate domain wall positioning. This asymmetric geometry allows the domain wall to be stabilized at specific locations during shifting operations, thereby improving shifting accuracy despite increased structural complexity.
Solution Approach 2:
The patent implements local quality by varying the dimensions of different portions of the magnetic member. The projection portions and concave portions have different cross-sectional areas and volumes, creating localized regions with distinct magnetic properties. This local variation in geometry allows different regions to serve specific functions: projection portions for domain wall nucleation and concave portions for domain wall stabilization, thereby improving overall shifting accuracy.
2Reliability
If a single current value shift pulse is used, then the operation is simple, but domain wall stabilization is insufficient leading to shift errors
Solution Approach 1:
The patent applies periodic action by using a multi-stage shift pulse sequence rather than a single pulse. The shift operation is divided into multiple stages with different current values: a first shift pulse with a first current value moves the domain wall to the target location, followed by a second shift pulse with a second current value that stabilizes the domain wall. This periodic, multi-stage approach improves reliability by ensuring proper domain wall stabilization while managing control complexity through systematic pulse sequencing.
Solution Approach 2:
The patent implements parameter changes by varying the current value of the shift pulse during the domain wall shifting process. The system transitions from a first current value during the initial shift phase to a second current value during the stabilization phase. This dynamic parameter adjustment allows the system to optimize performance at different stages of the shifting operation, improving domain wall stabilization and reducing shift errors.
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
This approach enhances the controllability and reliability of domain wall shifts, reducing shift errors and improving data storage accuracy by stabilizing the domain wall in the concave portion, thus ensuring precise data movement within the magnetic memory.
Implementation Method 1
a magnetic member including a first portion with a first dimension in a first direction, a second portion spaced from with the first portion in a second direction crossing the first direction and having a second dimension in the first direction
Implementation Method 2
utilizing a shift pulse with two distinct current values to stabilize and move domain walls in a controlled manner, reducing shift errors by stabilizing the domain wall in the concave portion after the shift operation
Data Source
AI summary
According to one embodiment, a device includes a member including a first portion having a first dimension in first direction, a second portion spaced from the first portion and having a second dimension in the first direction, a third portion between the first and second portions and having a third dimension in the first direction, and a fourth portion between the first and third portions and having a fourth dimension in the first direction; and a circuit to supply a shift pulse including first and second pulses to the member and move a domain wall in the member. The third dimension is less than the first dimension. The second and fourth dimensions are less than the third dimension. A second value of the second pulse is less than a first value of the first pulse.