Magnetic Memory Cell With Unpatterned Media For SSD Endurance
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Solution Overview
Problem
Current solid-state non-volatile memory technologies for Solid-State Drives (SSDs) face limitations in endurance, retention, and power consumption, requiring an enhanced magnetic memory cell solution.
Innovation Solution
A magnetic memory cell design featuring a first conductor M1 and a second conductor M2, with M2 being more conductive than M1, using unpatterned programmable magnetic media, and employing spin-biased steered or tunneling currents for programming and reading, enabling high endurance, low power consumption, and adequate retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If currently available solid-state non-volatile memory technologies are used, then data storage is achieved, but endurance limits of program/erase cycles are low
Solution Approach 1:
The patent replaces traditional electrical charge-based memory mechanisms with magnetic moment-based storage. The memory cell uses magnetic layers with opposite magnetization directions to represent binary states, eliminating the wear associated with electrical program/erase cycles in flash memory. This magnetic mechanism provides superior endurance as it does not involve physical degradation from repeated electrical stress.
Solution Approach 2:
The invention changes the fundamental storage parameter from electrical charge presence/absence to magnetic moment orientation. By utilizing the magnetic properties of materials and their ability to maintain stable magnetization states, the system achieves higher reliability and endurance compared to charge-based mechanisms that degrade over time.
2Reliability
If solid-state non-volatile memory technologies are used, then data storage is achieved, but power consumption is high
Solution Approach 1:
The patent employs periodic pulsed current rather than continuous current for writing magnetic states. The write operation uses brief current pulses to generate magnetic fields that switch magnetization directions, while read operations use minimal current to detect resistance states. This periodic action significantly reduces average power consumption compared to continuously powered systems.
Solution Approach 2:
The magnetic memory mechanism replaces energy-intensive electrical charge maintenance with low-energy magnetic moment stabilization. Once written, magnetic states persist without requiring continuous power, providing high retention with minimal standby power consumption.
3Ease of manufacture
If conventional memory cell design is used, then manufacturing is achieved, but manufacturing precision requirements are high
Solution Approach 1:
The patent transitions from planar two-dimensional memory cell layouts to three-dimensional vertical stack configurations. Multiple magnetic layers are stacked vertically with conductive elements connecting them through vias, allowing data storage in the vertical dimension. This reduces the footprint and relaxes lateral alignment precision requirements while maintaining manufacturing feasibility through sequential deposition processes.
Solution Approach 2:
The memory cell is segmented into distinct functional layers (magnetic layers, non-magnetic spacer layers, conductive layers) that can be manufactured separately and assembled through sequential deposition. This layer-by-layer fabrication approach reduces the need for complex simultaneous patterning operations and lowers overall manufacturing precision requirements.
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
The magnetic memory cell achieves high endurance, low power usage, and effective retention, addressing the limitations of existing SSD technologies.
Implementation Method 1
programmed in at least one of its magnetization states by a spin-biased steered current or spin-biased tunneling current
Implementation Method 2
programmed in at least one of its magnetization states by a spin-biased steered current or spin-biased tunneling current
Implementation Method 3
The magnetization state of the magnetic memory cell is sensed in a readout operation, for example, with steered currents in a low contrast readout operation or, for example, with tunneling currents in a high contrast readout operation
Data Source
AI summary
A magnetic memory cell and a method for implementing the magnetic memory cell for use in Solid-State Drives (SSDs) are provided. A magnetic memory cell includes a first conductor M1, and a second conductor M2 and a programmable area using unpatterned programmable magnetic media. At least one of the conductors M1, M2 is formed of a magnetic material, and the conductor M2 is more conductive than conductor M1. Steering of current is provided for programming the magnetic memory cell.