Magnetic Memory Domain-Wall Motion for Faster Data Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic memory technologies face challenges in efficiently storing and retrieving data using magnetic wires, particularly in terms of data retention and access speed.
Innovation Solution
A domain-wall motion memory design utilizing a tubular magnet with constricted dimensions and a domain wall retention structure, where data is stored by manipulating the magnetization direction of magnetic domains within a magnet, allowing for efficient data storage and retrieval through controlled domain wall movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If domain walls are stored in conventional magnetic wire structures, then data storage capability is achieved, but data retention stability deteriorates due to domain wall instability
Solution Approach 1:
The patent applies local quality by creating constricted regions with different magnetic properties compared to the bulk magnetic wire. These constricted regions have modified magnetization characteristics that provide enhanced domain wall pinning, thereby stabilizing domain walls at specific locations while maintaining data storage functionality. The local structural modification creates distinct zones with tailored magnetic properties for optimal domain wall retention.
Solution Approach 2:
The magnetic wire is segmented into distinct regions including constricted portions and regular portions along its length. This segmentation allows different sections to serve specific functions: constricted regions for stable domain wall storage and regular regions for domain wall movement and data manipulation. The segmented structure enables independent optimization of each region's magnetic properties.
2Quantity of substance
If magnetic wire diameter is reduced to increase storage density, then storage capacity improves, but domain wall stability deteriorates
Solution Approach 1:
Rather than uniformly reducing the magnetic wire diameter, the patent introduces localized constricted regions with reduced diameter within an otherwise maintained wire structure. These constricted portions provide enhanced domain wall pinning due to their reduced cross-section, while the overall wire diameter can be optimized for storage density. This local quality approach allows simultaneous achievement of high storage density and domain wall stability.
Solution Approach 2:
The patent addresses the diameter-stability tradeoff by introducing a new dimensional feature along the longitudinal axis of the magnetic wire. Instead of solely relying on radial dimension reduction, the constricted portions create variations in the longitudinal dimension, providing additional degrees of freedom for optimizing both storage density and domain wall stability through controlled diameter modulation along the wire length.
3Productivity
If conventional magnetic memory structures are used, then manufacturing simplicity is maintained, but data access speed deteriorates
Solution Approach 1:
The magnetic wire is divided into functionally distinct segments including constricted portions for data storage and regular portions for data manipulation. This segmentation enables parallel operation of multiple domain walls at different locations, thereby increasing data access speed. The segmented structure can be manufactured using modified conventional techniques, balancing complexity and performance.
Solution Approach 2:
The patent modifies the magnetic wire structure by changing the diameter parameter along its length to create constricted regions. This parameter change enables enhanced domain wall pinning and faster data access without requiring fundamentally new manufacturing processes. The diameter modulation can be achieved through existing fabrication techniques with minimal additional complexity.
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 proposed design enhances data storage efficiency and access speed by stabilizing domain walls in constricted regions, enabling faster and more reliable data manipulation.
Implementation Method 1
data is stored by manipulating the magnetization direction of magnetic domains within a magnet
Implementation Method 2
allowing for efficient data storage and retrieval through controlled domain wall movement
Data Source
AI summary
A memory includes: a magnet including a first and second portions adjacent in a first direction. The first portion has a first dimension in a second direction at a first position at which a dimension of the magnet in the second direction is maximum, the second direction perpendicular to the first direction, the second portion has a second dimension in the second direction at a second position at which a dimension of the magnet in the second direction is minimum, the second dimension smaller than the first dimension, the first portion is continuous to the second portion via a third position between the first and second positions, a curve corresponding to an outer of the magnet extends between the first and third positions, and the curve passes through a side closer to the central axis of the magnet than a straight line connecting the first and second positions.