Skyrmion Magnetic Element for High-Speed Low-Power Memory
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Solution Overview
Problem
The mechanism for generating, erasing, and detecting skyrmions in magnetic elements is not well understood, limiting their application in memory devices, and existing magnetic shift registers require high currents and have low transfer velocities for magnetic domain walls.
Innovation Solution
A magnetic element capable of generating, erasing, and detecting skyrmions using a chiral magnet with a spiral magnetic phase that transitions through a skyrmion crystal phase, utilizing a current path to apply magnetic fields and a skyrmion sensor to detect the presence of skyrmions, allowing for efficient storage and retrieval of information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If magnetic domain walls are driven by current in a magnetic shift register, then magnetic information can be transferred, but large current is required and transfer velocity is low
Solution Approach 1:
The invention changes the fundamental parameter being manipulated from magnetic domain walls to skyrmions. Skyrmions are topologically protected magnetic textures with different stability and mobility characteristics compared to domain walls, enabling lower current operation and higher transfer velocities while maintaining the core function of magnetic information transfer
Solution Approach 2:
The invention replaces the mechanical movement of magnetic domain walls with the topological transport of skyrmions. This substitution leverages the unique topological properties of skyrmions, which allow for more efficient current-driven motion with lower energy dissipation and higher speeds compared to traditional domain wall manipulation
2Productivity
If skyrmions are used as storage units, then high-capacity storage and rapid data processing are enabled, but the mechanism for generating, erasing, and detecting skyrmions is not clear
Solution Approach 1:
The invention introduces a magnetic sensor as an intermediary component that detects skyrmions through their magnetic field signature. This mediator enables indirect observation of the skyrmion state without requiring direct manipulation, solving the detection challenge while preserving the high-speed data processing capabilities of skyrmion-based storage
Solution Approach 2:
The invention utilizes changes in magnetic moment orientation (analogous to color changes in optical systems) as the skyrmion is generated or erased. The magnetic sensor detects these orientation changes, providing a clear signal for skyrmion presence or absence that enables reliable detection while maintaining high-speed operation
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 high-speed, low-power generation and erasure of skyrmions with precise control, suitable for high-capacity storage and rapid data processing, outperforming traditional memory technologies in speed and endurance.
Implementation Method 1
a chiral magnet which has a spiral magnetic phase that transitions through a skyrmion crystal phase
Implementation Method 2
utilizing a current path to apply magnetic fields
Implementation Method 3
a skyrmion sensor to detect the presence of skyrmions
Data Source
Figure 1
Figure 2(A)~2(E)
Figure 3
AI summary
Provided is a magnetic element, a skyrmion memory, and the like that have a nearly infinite endurance (durability) for the number of times data is written and nearly eternal data retention (holding) characteristics, and are capable of writing and erasing at ultra-high speed. For example, provided is a magnetic element capable of generating and erasing a skyrmion, including a magnet shaped as a thin layer and including a structure surrounded by a nonmagnetic material; a current path provided surrounding an end region including an end portion of the magnet, on one surface of the magnet; and a skyrmion sensor that detects the generation and erasing of the skyrmion. With Wm being a width of the magnet and hm being a height of the magnet, a size of the magnet, with the skyrmion of a diameter λ being generated, is such that 2λ > Wm > λ/2 and 2λ > hm > λ/2. With W being a width of the end region in a direction parallel to the end portion of the magnet and h being a height of the end region in a direction perpendicular to the end portion of the magnet, the end region is such that λ ≥ W > λ/4 and 2λ > h > λ/2.