Magnetic Domain Wall Element Layout for Stable Initial Magnetization
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Solution Overview
Problem
Existing magnetic domain wall displacement elements face challenges in defining an initial state due to differing orientation directions of magnetization fixed regions, leading to reduced reliability and stability when attempting to stabilize magnetization with a magnetic field.
Innovation Solution
A magnetic domain wall displacement element comprising a first ferromagnetic layer, a second ferromagnetic layer, a nonmagnetic layer, and conductive parts with specific intermediate layers, where the areas and orientations of magnetization regions are strategically designed to facilitate easy definition of an initial state by applying an external magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetization fixed regions with different orientation directions are disposed at both ends of the data recording layer, then data recording in multiple values is enabled, but it becomes difficult to define an initial state by simply applying a magnetic field in one direction
Solution Approach 1:
The patent introduces a reference layer with a specific magnetization orientation that serves as a local quality reference for the magnetic domain wall displacement element. This reference layer is positioned adjacent to the data recording layer and provides a consistent magnetization direction that facilitates initial state definition, while the data recording layer maintains its ability to store multiple values through domain wall displacement between regions with different magnetization orientations.
2Stability of the object's composition
If a magnetic field in two directions is applied to stabilize the two magnetization fixed regions, then magnetization stability is improved, but a portion with magnetization oriented in a direction different from the desired magnetization direction may be generated, reducing element reliability
Solution Approach 1:
The patent introduces a reference layer as an intermediary element that mediates between the two magnetization fixed regions with different orientations. This reference layer provides a consistent magnetization direction that prevents the generation of unwanted magnetization orientations, thereby maintaining element reliability while still allowing magnetization stability to be achieved.
Solution Approach 2:
The magnetic domain wall displacement element is segmented into distinct functional layers: a reference layer with a specific magnetization orientation, a data recording layer with regions of different magnetization orientations, and magnetization fixed regions at both ends. This segmentation allows each layer to perform its specific function without interfering with the reliability of other layers.
3Adaptability or versatility
If magnetization fixed regions with different orientation directions are used, then multivalued recording is enabled, but the device complexity increases due to the need for multiple magnetization orientations
Solution Approach 1:
The device is segmented into distinct layers with specific functions: the reference layer provides a consistent magnetization orientation, the data recording layer contains regions with different orientations for multivalued recording, and magnetization fixed regions stabilize the system. This segmentation manages complexity by assigning specific roles to each layer.
Solution Approach 2:
Different regions of the device have locally optimized magnetization orientations suited to their specific functions. The reference layer has a uniform orientation for stability, while the data recording layer has varied orientations for multivalued recording capability. This local quality approach enables multivalued recording without uniformly increasing complexity throughout the entire device.
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 design allows for a straightforward definition of the initial state, enhancing the reliability and stability of the magnetic domain wall displacement element, improving yield and operational consistency.
Implementation Method 1
a first intermediate layer and a second conductive part including a second intermediate layer which are spaced apart from each other and connected to the second ferromagnetic layer, in which the first intermediate layer is sandwiched between a first magnetization region exhibiting a first magnetization direction and a second magnetization region exhibiting a second magnetization direction different from the first magnetization direction
Data Source
AI summary
A magnetic domain wall displacement element includes a first ferromagnetic layer, a second ferromagnetic layer extending in a second direction and magnetically recordable, a nonmagnetic layer, and a first conductive part having a first intermediate layer and a second conductive part having a second intermediate layer, in which the first intermediate layer is sandwiched between first and second magnetization regions and exhibiting first and second magnetization directions, the second intermediate layer is sandwiched between a third magnetization region and exhibiting the second magnetization direction and a fourth magnetization region exhibiting the first magnetization direction in the first direction, and an area of the first magnetization region is larger than an area of the second magnetization region and an area of the third magnetization region is smaller than an area of the fourth magnetization region in a cross section in the first direction and the second direction.