Magnetic Recording Medium Layered Structure Stabilization
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Solution Overview
Problem
Current magnetic recording technologies face challenges in increasing recording density due to inefficient magnetization control and stability, particularly in downscaling recording patterns and thermal stability.
Innovation Solution
A magnetic recording medium with a layered structure comprising magnetic regions and nonmagnetic regions, where the easy magnetization axes are aligned, and the magnetic anisotropy energy is manipulated to control magnetization oscillations using an alternating magnetic field, enabling stable and efficient recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recording density is increased by downscaling recording patterns, then higher storage capacity is achieved, but magnetization control stability deteriorates
Solution Approach 1:
The magnetic recording medium is divided into multiple magnetic layers (first magnetic layer, second magnetic layer, third magnetic layer) with distinct functions. The first and second magnetic layers form a magnetization control structure, while the third magnetic layer serves as the recording layer. This segmentation allows independent optimization of magnetization control stability and recording density, resolving the contradiction between downscaling for higher density and maintaining stability.
Solution Approach 2:
The patent employs a composite magnetic layer structure where different magnetic materials with specific magnetic anisotropy energies are combined. The magnetization control layers have different magnetic anisotropy energy densities than the recording layer, creating a composite system that stabilizes magnetization while enabling high-density recording through controlled magnetic interactions.
2Reliability
If magnetic anisotropy energy is increased to improve thermal stability, then thermal stability is improved, but magnetization oscillation control becomes difficult
Solution Approach 1:
Different regions of the magnetic recording medium have different magnetic anisotropy energy densities tailored to their specific functions. The magnetization control layers have higher magnetic anisotropy energy densities for thermal stability, while the recording layer has optimized magnetic anisotropy for responsive magnetization oscillation control. This local differentiation resolves the contradiction between thermal stability and ease of magnetization control.
3Reliability
If multiple magnetic layers are added to improve magnetization control, then magnetization stability is improved, but device structure becomes more complex
Solution Approach 1:
The first and second magnetic layers serve multiple functions: they provide magnetization control through their magnetic interactions, contribute to thermal stability through their magnetic anisotropy, and enable the overall layered structure to achieve high-density recording. This multi-functionality reduces the need for additional separate components, managing device complexity while improving magnetization stability.
Data Source
AI summary
According to one embodiment, a magnetic recording medium includes a first layer and a second layer. The first layer includes a first magnetic region, a second magnetic region, and a nonmagnetic region provided between the first and second magnetic regions. A direction from the second magnetic region toward the first magnetic region is along a first direction. The second layer includes third, fourth, and fifth magnetic regions. At least a portion of the fifth magnetic region is provided between the third and fourth magnetic regions. The third magnetic region overlaps the first magnetic region in a second direction crossing the first direction. The fourth magnetic region overlaps the second magnetic region in the second direction. The fifth magnetic region overlaps the nonmagnetic region in the second direction. An easy magnetization axis of each of the first to fifth magnetic regions is aligned with the second direction.