3D Optical Memory Storage Cells for High Density Data
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Solution Overview
Problem
As magnetic recording media approaches maturity, increasing bit density to enhance storage capacity becomes challenging due to decreased signal-to-noise ratio and increased susceptibility to thermal fluctuations, making it difficult to maintain storage capacity while reducing bit size or stack thickness.
Innovation Solution
A three-dimensional storage device using electrical information storage cells that alter electrical orientations and intensities with high-power lasers for writing and maintain them with low-power lasers for reading, allowing precise focusing without interfering with other cells, and utilizing transparent materials to minimize heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bit density is increased to store more information, then storage capacity is improved, but signal-to-noise ratio deteriorates and thermal stability decreases
Solution Approach 1:
The patent transitions from two-dimensional planar storage to three-dimensional storage by stacking multiple storage layers vertically. This dimensional change allows increased storage capacity without reducing bit size in the planar direction, thereby maintaining signal-to-noise ratio and thermal stability. The vertical stacking enables multiple storage cells to occupy different z-positions while maintaining adequate separation distances.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different regions of the storage medium. Specifically, it uses perpendicular magnetic anisotropy in the storage layers to enhance thermal stability, and employs distinct magnetic layer compositions (e.g., CoFeB, CoFe) with different coercivity values to optimize signal detection while maintaining stability against thermal fluctuations.
2Quantity of substance
If bit size is reduced to increase density, then storage capacity is improved, but susceptibility to thermal activation increases
Solution Approach 1:
The patent changes key magnetic parameters including introducing perpendicular magnetic anisotropy through engineered interface structures and composition gradients. By adjusting the thickness and material composition of magnetic layers (e.g., using ultrathin CoFeB layers with specific saturation magnetization values), the patent optimizes the energy barrier for thermal activation while maintaining small bit dimensions for high density.
Solution Approach 2:
The patent employs composite magnetic structures consisting of multiple layers with different magnetic properties, including hard and soft magnetic layers, damping layers, and spacer layers. These composite structures provide enhanced thermal stability through exchange coupling and magnetic anisotropy engineering, allowing small bit sizes without compromising stability.
3Quantity of substance
If stack thickness is reduced to increase capacity, then storage density is improved, but thermal stability deteriorates
Solution Approach 1:
The patent utilizes phase transition materials (e.g., GST - GeSbTe) in the storage structure that can switch between crystalline and amorphous phases with distinct magnetic properties. This enables stable magnetic states at reduced thickness by leveraging the high anisotropy energy of the phase-transitioned materials, maintaining thermal stability while achieving high storage density.
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
Enables increased bit density without compromising signal-to-noise ratio or thermal stability, allowing for efficient and reliable information storage and retrieval in a three-dimensional structure.
Implementation Method 1
The first storage cell is configured to change the electrical property in response to a first light energy
Implementation Method 2
The first storage cell is also configured to alter the change to the electrical property in response to a second light energy
Data Source
AI summary
An apparatus includes a first storage cell with an electrical property. The first storage cell is configured to change the electrical property in response to a first light energy, and to maintain the change to the electrical property. The first storage cell is also configured to alter the change to the electrical property in response to a second light energy, and to maintain the alteration to the change to the electrical property. A second storage cell disposed over the first storage cell in a vertical plane of the first storage cell. A third storage cell disposed adjacent to the first storage cell in a horizontal plane of the first storage cell.