Magnetic Recording Array Asymmetry for Domain Wall Stability
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Solution Overview
Problem
Domain wall motion elements in magnetic recording arrays experience reduced magnetic stability and controllability due to orientation differences between their end portions, leading to repulsion and instability when arranged in the same configuration.
Innovation Solution
A magnetic recording array design featuring domain wall motion elements with differently oriented magnetization end portions, connected by specific wiring configurations and transistors, which improves magnetic stability and controllability by optimizing the arrangement and integration of these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If domain wall motion elements are arranged in the same configuration to improve integration density, then the occupied area is reduced, but magnetic stability decreases due to repulsion between elements with different magnetization orientations
Solution Approach 1:
The patent applies asymmetry by introducing a dummy element adjacent to the domain wall motion element. This dummy element has a magnetization orientation that is symmetric to the domain wall motion element's orientation with respect to the vertical direction, creating an asymmetric arrangement that balances magnetic interactions and stabilizes the magnetization state while maintaining high integration density
Solution Approach 2:
The dummy element acts as an intermediary that mediates the magnetic interaction between neighboring domain wall motion elements. By positioning the dummy element adjacent to the domain wall motion element and giving it a specific magnetization orientation, it serves as a buffer that reduces repulsive magnetic forces and enhances overall magnetic stability
2Quantity of substance
If domain wall motion elements are arranged in the same configuration to improve integration, then element density increases, but controllability decreases due to magnetic repulsion and instability
Solution Approach 1:
The asymmetric arrangement of the dummy element with respect to the domain wall motion element creates a controlled magnetic environment. This asymmetry allows for better control over domain wall motion by reducing unwanted magnetic repulsion, thereby improving controllability while maintaining high element density
Solution Approach 2:
The dummy element serves as a controllable intermediary that facilitates precise control over the magnetic state of neighboring domain wall motion elements. By adjusting the magnetization orientation of the dummy element, the magnetic interaction can be tuned to enhance controllability of the memory cell operations
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 magnetic stability and controllability, allowing for denser integration and regular arrangement of domain wall motion elements, thereby improving the overall performance of the magnetic recording array.
Implementation Method 1
A domain wall motion element that utilizes domain wall motion is an example of a spin memristor
Implementation Method 2
each of the domain wall motion elements includes: a first ferromagnetic layer; a domain wall motion layer
Data Source
AI summary
A magnetic recording array includes domain wall motion elements and wirings, the domain wall motion elements includes first, second, and third elements, each having a magnetic wall motion layer with first and second end portions, the second element has the second end portion closest to the first end portion of the first element, the third element has the second end portion closest or second closest to the first end portion of the first element, a first distance between the first end portion of the first element and the second end portion of the second element and a second distance between the first end portion of the first element and the second end portion of the third element are shorter than a third distance between the first end portion of the first element and the first end portion closest to the first end portion of the first element.