Magnetic Recording Element Domain Wall Control via Base Body Inversion
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Solution Overview
Problem
The magnetic domain wall movement type magnetic recording element described in Patent Literature 1 faces issues with damage to the lamination surface during post-processing, leading to a decrease in magnetoresistance change rate (MR ratio) and reduced magnetization stability, causing noise due to concavity and convexity on the side surface of the magnetic recording layer.
Innovation Solution
A magnetic domain wall movement type magnetic recording element is designed with a concave-convex structure on the second surface of the magnetic recording layer, where the first surface has a smaller arithmetic average roughness and the convex portions are irregularly spaced, and an intermediate body with a trap-reinforcing member is used between the base body and the magnetic recording layer, covered by an insulating layer to control the movement of the magnetic domain wall without active control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If concavity and convexity are formed on the side surface of the magnetic recording layer through post-processing, then the magnetic domain wall position is controlled, but damage occurs on the lamination surface causing decreased magnetoresistance change rate
Solution Approach 1:
Instead of forming concavity and convexity on the side surface of the magnetic recording layer through post-processing, the invention inverts the approach by forming the concave-convex structure on the base body before laminating the magnetic recording layer. This allows the magnetic domain wall to be controlled by the structure on the base body rather than by modifying the magnetic recording layer itself, thereby avoiding damage to the lamination surface and maintaining high magnetoresistance change rate.
Solution Approach 2:
The concave-convex structure is formed on the base body in advance before the magnetic recording layer is laminated. This preliminary formation of the trapping structure eliminates the need for subsequent post-processing steps that would otherwise be required to create concavity and convexity on the magnetic recording layer, thus preventing damage to the lamination surface while still achieving magnetic domain wall control.
2Manufacturing precision
If trap site is provided on the lamination surface of the magnetic recording layer, then magnetic domain wall movement is controlled, but magnetization stability of ferromagnetic body decreases causing noise
Solution Approach 1:
The invention introduces the base body with concave-convex structure as an intermediary element that controls magnetic domain wall movement. Instead of directly providing trap sites on the lamination surface of the magnetic recording layer, the control function is mediated through the base body structure, which indirectly influences the magnetic domain wall without compromising the magnetization stability of the ferromagnetic body.
Solution Approach 2:
The invention inverts the conventional approach by placing the trapping structure on the base body rather than on the magnetic recording layer's lamination surface. This reversal allows magnetic domain wall control to be achieved without directly interfering with the magnetization stability of the ferromagnetic body, thereby reducing noise.
3Manufacturing precision
If post-processing is performed to form concavity and convexity, then magnetic domain wall trapping is achieved, but additional processing steps increase the risk of lamination surface damage
Solution Approach 1:
The concave-convex structure is formed on the base body in advance during the base body fabrication process, before the magnetic recording layer is laminated. This preliminary formation of the trapping structure integrates the magnetic domain wall control function into the base body manufacturing, eliminating the need for separate post-processing steps and thereby reducing the overall number of processing steps and the associated risk of lamination surface damage.
Solution Approach 2:
The invention merges the magnetic domain wall trapping function with the base body structure by forming the concave-convex structure on the base body itself. This consolidation combines two functions (base body support and magnetic domain wall trapping) into a single component, eliminating the need for separate post-processing steps to create trapping structures on the magnetic recording layer.
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 configuration enhances the controllability of the magnetic domain wall movement, maintains a high magnetoresistance change rate, and reduces noise by trapping the domain wall effectively without requiring additional processing steps that could damage the lamination surface.
Implementation Method 1
the magnetic recording layer has a concave-convex structure on a second surface opposite to a first surface which faces the non-magnetic layer
Implementation Method 2
The magnetic domain wall movement type magnetic recording element reads and writes data using a change in magnetoresistance. The change in magnetoresistance is caused by a change in the magnetization state between the magnetic recording layer and the ferromagnetic layer
Data Source
AI summary
A magnetic domain wall movement type magnetic recording element includes: a first ferromagnetic layer which includes a ferromagnetic body; a non-magnetic layer which faces the first ferromagnetic layer; and a magnetic recording layer which faces a surface of the non-magnetic layer on a side opposite to the first ferromagnetic layer and extends in a first direction. The magnetic recording layer has a concave-convex structure on a second surface opposite to a first surface which faces the non-magnetic layer.