Magnetic Storage Device External Field Adaptation
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Solution Overview
Problem
Magnetic storage devices, such as MRAM, face challenges in maintaining reliability and data integrity in environments with strong external magnetic fields, as these fields can deteriorate retention characteristics and increase write errors.
Innovation Solution
Incorporating a magnetic sensor to measure external magnetic fields and adjusting the scrubbing process and write operations accordingly, such as shortening scrubbing time intervals and increasing the number of write operations, to maintain data integrity and prevent errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If magnetic storage devices operate in environments with strong external magnetic fields, then device complexity is reduced by eliminating magnetic shielding, but data integrity and reliability deteriorate due to increased write errors and retention characteristic degradation
Solution Approach 1:
The patent changes operational parameters (scrubbing time intervals and write operation counts) based on the measured magnitude of external magnetic fields. When strong magnetic fields are detected, the system shortens scrubbing intervals and increases write operation repetitions, thereby maintaining data integrity without requiring magnetic shielding structures.
Solution Approach 2:
The patent implements a feedback mechanism where a magnetic sensor continuously monitors external magnetic field strength, and the controller adjusts scrubbing and write operations accordingly. This closed-loop control enables the system to adapt to varying magnetic environments, maintaining reliability while operating without magnetic shielding.
2Reliability
If scrubbing time intervals are shortened to maintain data integrity in strong magnetic fields, then reliability improves, but energy consumption and operational overhead increase
Solution Approach 1:
The patent dynamically adjusts scrubbing time intervals based on real-time magnetic field measurements. Instead of using fixed intervals, the system shortens intervals only when strong magnetic fields are detected and returns to normal intervals when fields weaken, thereby maintaining reliability while minimizing unnecessary energy consumption during normal operating conditions.
3Reliability
If the number of write operations is increased to prevent write errors in strong magnetic fields, then data integrity improves, but productivity and operational speed decrease
Solution Approach 1:
The patent employs periodic write operations with variable repetition counts based on magnetic field strength. When strong magnetic fields are detected, the system performs multiple write operations to ensure data integrity. When magnetic fields are weak, the system performs single write operations, thereby maintaining write accuracy when necessary while preserving productivity during normal conditions.
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 the reliability and tolerance of magnetic storage devices to external magnetic fields, allowing them to operate effectively in environments with strong magnetic influences without the need for additional magnetic shielding, thus contributing to product downsizing.
Implementation Method 1
A magnetic sensor configured to measure a magnitude of an external (ambient) magnetic field
Implementation Method 2
magnetoresistance random access memory (MRAM) using a magnetoresistance effect element as a storage element
Data Source
AI summary
According to one embodiment, a magnetic storage device includes a nonvolatile magnetic memory including a magnetoresistance effect element capable of storing data. A magnetic sensor is configured to measure the magnitude of an external magnetic field. A controller is configured to detect errors in the data at first time intervals when the measured magnitude of the external magnetic field is less than a threshold value and to detect errors in the data at second time intervals shorter than the first time interval when the measured magnitude of the external magnetic field is equal to or greater than the threshold value.