Magnetic Domain Wall Element with Gradient Non-Magnetic Layer
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Solution Overview
Problem
Magnetic domain walls in magnetic recording layers are not sufficiently fixed, leading to unstable movement and potential disappearance, which affects the reliability and accuracy of data recording in magnetic memory devices.
Innovation Solution
A magnetic domain wall movement element is designed with a wiring layer, a non-magnetic layer, and conductive layers where the non-magnetic layer is thinner between the conductive layers and the wiring layer, and the conductive layers are connected to the wiring layer either directly or via the non-magnetic layer, enhancing the magnetic coupling and stability of the domain wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic coupling layer is provided between magnetic recording layer and first magnetization fixing region, then magnetization can be fixed, but magnetic coupling may not be sufficiently obtained and magnetic domain may be insufficiently fixed
Solution Approach 1:
A non-magnetic layer is introduced as an intermediary between the first conductive layer and the wiring layer. This non-magnetic layer has a gradient thickness configuration where it is thinner at positions between the conductive layers and the wiring layer, and thicker at positions overlapping the ends of the conductive layers. This intermediary structure enables sufficient magnetic coupling while maintaining magnetic domain fixation.
Solution Approach 2:
The non-magnetic layer is designed with spatially varying thickness: thinner regions are positioned where strong magnetic coupling is needed (between conductive layers and wiring layer), while thicker regions are positioned where magnetic isolation is needed (overlapping conductive layer ends). This local quality variation resolves the contradiction between coupling strength and domain fixation.
2Adaptability or versatility
If magnetic domain wall is formed by twisting magnetization direction in magnetic recording layer, then multi-valued data recording is enabled, but magnetic domain wall movement becomes unstable and may disappear
Solution Approach 1:
The non-magnetic layer acts as a mediator that stabilizes the magnetic domain wall by providing controlled magnetic coupling. The gradient thickness configuration ensures that the domain wall remains stable during movement, preventing disappearance while enabling multi-valued data recording through controlled twisting of magnetization direction.
Solution Approach 2:
The thickness parameter of the non-magnetic layer is varied spatially to optimize magnetic domain wall stability. By changing the thickness from thin (for coupling) to thick (for isolation), the magnetic parameters are tuned to maintain stable domain wall movement throughout the recording layer, enabling reliable multi-valued data storage.
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 movement of the magnetic domain wall, preventing its invasion into fixed magnetization regions and disappearance, thereby improving the reliability and accuracy of data recording in magnetic memory devices.
Implementation Method 1
the non-magnetic layer is thinner between the conductive layers and the wiring layer, and the conductive layers are connected to the wiring layer either directly or via the non-magnetic layer, enhancing the magnetic coupling and stability of the domain wall
Data Source
AI summary
A magnetic domain wall movement element includes a wiring layer containing a ferromagnetic material, a non-magnetic layer in contact with the first surface of the wiring layer, a first conductive layer connected to the first surface of the wiring layer and containing a ferromagnetic material; and a second conductive layer connected to the wiring layer at a distance from the first conductive layer. A first part of the connection face of the first conductive layer is directly connected to the wiring layer, and a second part of the connection face other than the first part is connected to the wiring layer via the non-magnetic layer.