Magnetic Memory Initialization via Domain Wall Control
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Solution Overview
Problem
Existing magnetic memory devices face challenges in achieving stable movement of magnetic domain walls and high integration, requiring complex initialization processes and efficient operation methods.
Innovation Solution
A method for operating a magnetic memory device involving a magnetic track layer with a first and second magnetic fixed unit and a magnetic translation unit, where specific magnetic fields and currents are applied to initialize and stabilize the magnetization directions of the units, allowing for efficient data storage and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex initialization process is used to stabilize magnetization directions, then the reliability of magnetic domain wall movement is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-establishing the anti-parallel magnetization configuration between the first and second magnetic pads through a specific sequence of magnetic field and current applications before normal operation begins. This preliminary initialization ensures that the magnetic translation unit starts in a stable state, eliminating the need for complex ongoing stabilization processes during operation.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting magnetic field strength and current magnitude during the initialization process. Specifically, it applies a first magnetic field to align magnetization, then a second magnetic field in an opposite direction to create anti-parallel states, while controlling current pulses to facilitate domain wall movement and stabilization. These controlled parameter variations enable reliable initialization without operational complexity.
2Reliability
If magnetic fields and currents are applied to stabilize magnetization directions, then the reliability of data storage is improved, but the use of energy deteriorates
Solution Approach 1:
The patent implements periodic action through the sequential application of magnetic fields and current pulses in a repeated cycle. The process involves applying a magnetic field, then a current pulse, then an opposite magnetic field, and repeating this sequence. This periodic application efficiently stabilizes magnetization directions by progressively reinforcing the anti-parallel configuration between magnetic pads while minimizing total energy consumption compared to continuous application methods.
Solution Approach 2:
The patent employs parameter changes by varying the magnitude and direction of magnetic fields and currents at different stages of initialization. It applies a first magnetic field with a certain strength, then a second magnetic field with opposite direction, while adjusting current pulse parameters accordingly. These optimized parameter variations achieve stable magnetization configuration with reduced energy consumption by applying fields and currents only when necessary and at the minimum effective strength.
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 proposed method simplifies the initialization process, stabilizes the magnetization directions, and enables efficient operation of magnetic memory devices, supporting stable movement of magnetic domain walls and high integration.
Implementation Method 1
A first magnetic field is applied to the magnetic track layer so that the first magnetic fixed unit, the second magnetic fixed unit, and the magnetic translation unit have magnetization directions that are parallel to one another
Implementation Method 2
A first current is applied to the magnetic track layer so that a multi-domain is formed in the magnetic translation unit
Implementation Method 3
A second magnetic field is applied to the magnetic track layer so that a magnetization direction of the magnetic translation unit becomes anti-parallel to magnetization directions of the first magnetic fixed unit and the second magnetic fixed unit
Implementation Method 4
A second current is applied to the magnetic track layer so that a portion of the multi-domain penetrates into the first magnetic fixed unit
Implementation Method 5
A third magnetic field is applied to the magnetic track layer so that the magnetization direction of the first magnetic fixed unit becomes anti-parallel to the magnetization direction of the second magnetic fixed unit
Data Source
AI summary
A method of operating a magnetic memory device includes: (i) applying a first current to a free layer of a magnetic tunnel junction structure, which includes a magnetic translation unit (MTU) extending between a first magnetic pad and a second magnetic pad, and a tunnel barrier layer and a pinned layer stacked on the MTU, so that a multi-domain is established within the MTU, (ii) applying a magnetic field to the free layer so that the magnetization direction of the MTU switches to become anti-parallel to the magnetization directions of the first magnetic pad and the second magnetic pad, (iii) applying a second current to the free layer so that a portion of the multi-domain penetrates into the first magnetic pad, and (iv) applying another magnetic field to the free layer so that the magnetization direction of the first magnetic pad switches.