Magnetic Memory Write Control Using Initialization and State Inversion
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Solution Overview
Problem
Conventional magnetoresistive RAM (MRAM) technologies require a long time period for data writing due to the need to read data during the writing process.
Innovation Solution
A memory device with a magnetic memory element that includes a reference layer and a storage layer, utilizing an auxiliary magnetic field and controlled voltage and magnetic fields to transition between parallel and anti-parallel states for data storage, allowing for separate initialization and state inversion processes to reduce writing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is read during the writing process in conventional MRAM, then data accuracy can be verified, but the writing time period becomes long
Solution Approach 1:
The writing process is segmented into two distinct phases: initialization phase (applying initialization voltage and magnetic field to set anti-parallel state) and state inversion phase (applying state inversion voltage and magnetic field to transition to parallel state). This segmentation allows each phase to be optimized independently and eliminates the need for read verification during writing, thereby reducing total writing time while maintaining reliability through controlled state transitions
Solution Approach 2:
The initialization process is performed as a preliminary action before state inversion. By pre-setting the magnetic memory element to the anti-parallel state through initialization voltage and magnetic field application, the subsequent writing operation only requires state inversion, which is faster and does not require read verification, thus reducing the overall writing time period
2Productivity
If initialization and state inversion are performed separately, then writing speed is improved, but the control process becomes more complex
Solution Approach 1:
The magnetic memory element is designed with multi-functionality to respond to different voltage and magnetic field combinations. The same magnetic memory element structure handles both initialization (anti-parallel state setting) and state inversion (parallel state transition) through unified control mechanisms, avoiding the need for separate hardware paths and simplifying the overall control architecture despite the two-phase process
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 solution facilitates faster data writing by optimizing the transition between magnetic states, reducing the overall time required for data storage operations.
Implementation Method 1
an auxiliary magnetic field application unit that applies an auxiliary magnetic field supporting transition of the magnetic memory element from the parallel state to the anti-parallel state
Implementation Method 2
a magnetic memory element that includes a reference layer having a fixed magnetization direction, and a storage layer stacked on the reference layer via an insulating layer and having a reversible magnetization direction, and that stores data in association with two states of a parallel state and an anti-parallel state
Data Source
AI summary
Provided is a memory device that includes a magnetic memory element, an auxiliary magnetic field application unit, and a write control unit, in which the magnetic memory element includes a reference layer having a fixed magnetization direction, and a storage layer and having a reversible magnetization direction, and that stores data in association with two states of a parallel state and an anti-parallel state, the auxiliary magnetic field application unit applies an auxiliary magnetic field supporting transition of the magnetic memory element from the parallel state to the anti-parallel state, and the write control unit performs initialization by applying an initialization voltage and an initialization magnetic field to the magnetic memory element to bring the magnetic memory element into the anti-parallel state, and writing by performing state inversion to apply a state inversion voltage and a state inversion magnetic field to the initialized magnetic memory element, according to the data.