Magnetic Memory Write Pulse Segmentation for Stable Magnetization
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Solution Overview
Problem
Existing magnetic memories face challenges in reliability and power consumption due to high temperature fluctuations during data writing, leading to potential write errors and increased power consumption.
Innovation Solution
The magnetic memory employs a write current comprising multiple pulses, where the second pulse has a shorter duration than the first, to control temperature fluctuations and stabilize magnetization direction, thereby reducing write errors and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single write current pulse is applied to the magnet, then the data writing operation is simple and fast, but temperature fluctuations occur causing write errors and increased power consumption
Solution Approach 1:
The write current is divided into multiple pulses (first pulse and second pulse) with different characteristics. The first pulse has a longer duration to generate sufficient heat for magnetization switching, while the second pulse has a shorter duration to stabilize the magnetization direction and reduce temperature fluctuations, thereby improving write reliability without excessive complexity
Solution Approach 2:
The write operation uses periodic pulsed current instead of a single continuous pulse. By applying alternating pulses with specific timing and duration differences, the system achieves better temperature control and magnetization stability, reducing write errors while maintaining operational efficiency
2Reliability
If a long duration write current pulse is applied, then the magnetization switching is reliable, but temperature fluctuations increase causing write errors
Solution Approach 1:
The write current waveform is segmented into two distinct pulses: the first pulse provides the necessary thermal energy for magnetization switching, while the second pulse with shorter duration stabilizes the magnetization direction and minimizes excessive temperature rise, thus achieving reliable switching with controlled temperature fluctuations
Solution Approach 2:
The patent changes the temporal parameters of the write current by using pulses with different durations. The first pulse has a longer width to ensure switching, while the second pulse has a shorter width to control temperature, dynamically adjusting current parameters to balance switching reliability and temperature control
3Productivity
If high current is used for data writing, then the write speed is fast, but power consumption increases
Solution Approach 1:
Instead of applying a single high-current pulse, the system uses periodic pulses with optimized durations. The first pulse performs the main switching function, and the second shorter pulse completes the stabilization, reducing the total energy required while maintaining write speed through efficient current utilization
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 approach enhances data write reliability and reduces power consumption by stabilizing magnetization direction and minimizing temperature-induced fluctuations, ensuring consistent data storage operations.
Implementation Method 1
a magnet configured to store data and shift the data from a first area to a second area by domain wall movement caused by a shift operation
Implementation Method 2
a first interconnect spaced apart from the magnet and configured to apply a first write field to the magnet at a time of a write operation
Data Source
AI summary
According to one embodiment, a magnetic memory includes: a magnet configured to store data and shift the data from a first area to a second area by domain wall movement caused by a shift operation; an interconnect spaced apart from the magnet and configured to apply a write field to the magnet at a time of a write operation; and a control circuit configured to cause a shift current for shifting the data to flow in the magnet and to cause a write current for generating the write field to flow in the interconnect, wherein the write current includes a first pulse supplied to the interconnect and a second pulse supplied to the interconnect after the first pulse, and a pulse width of the second pulse is smaller than a pulse width of the first pulse.