Magnetic Memory Device with Segmented Track for Stable Bit Shift
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Solution Overview
Problem
Magnetic memory devices face instability in operations due to variations in current densities caused by differences in bit shift speeds, leading to errors in magnetization information movement within the magnetic domains.
Innovation Solution
The magnetic memory device incorporates a first magnetic portion with alternating bottom and top portions along a direction, where the distances between these portions are varied to match the differences in current densities, ensuring stable operations by setting specific distance ratios and cross-sectional areas to maintain consistent bit shift speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current is applied to shift magnetic domains in a magnetic memory device, then magnetization information can be moved along the track, but variations in current densities cause unstable operations and errors in magnetization information movement
Solution Approach 1:
The magnetic track is divided into multiple segments with different cross-sectional areas along its length. Each segment has a locally optimized cross-sectional area designed to compensate for variations in current density at that specific position, ensuring uniform bit shift speed across the entire track despite current density variations
Solution Approach 2:
The cross-sectional area parameter of the magnetic track is deliberately varied along its length to counteract current density variations. By changing the geometric parameter (cross-sectional area) in response to current density changes, the patent achieves consistent bit shift speeds and stable operations
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 and precision of magnetization information shift, improving the stability and accuracy of magnetic memory device operations by minimizing errors caused by varying current densities.
Implementation Method 1
a first magnetic portion extending in a first direction... magnetic domains of a track including a magnetic material are shifted by causing a current to flow in the track
Data Source
AI summary
According to one embodiment, a magnetic memory device includes a first magnetic portion extending in a first direction, a first magnetic layer, and a first nonmagnetic layer provided between the first magnetic layer and a portion of the first magnetic portion. The first magnetic portion has a first surface. The first surface includes bottom portions, and top portions. The bottom portions and the top portions are arranged alternately in the first direction. The bottom portions include a first bottom portion, a second bottom portion adjacent to the first bottom portion in the first direction, a third bottom portion, and a fourth bottom portion adjacent to the third bottom portion in the first direction. The top portions include a first top portion provided between the first bottom portion and the second bottom portion, and a second top portion provided between the third bottom portion and the fourth bottom portion.