Emerging memories

In MRAM, what problem tends to arise if the storage element (MTJ) is made too small?

  1. AThermal fluctuations can easily reverse the magnetization, making data retention difficult
  2. BThe element emits light
  3. CThe element's resistance becomes zero
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Answer: A. Thermal fluctuations can easily reverse the magnetization, making data retention difficult

The energy that keeps a magnet's magnetization stable decreases as its volume shrinks, so thermal energy can reverse the magnetization spontaneously. Securing sufficient thermal stability to retain data for a long time is one of the challenges in scaling MRAM.

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More Emerging memories questions

  1. Why have MTJs with magnetization perpendicular to the film plane (perpendicular MTJs) become mainstream in recent STT-MRAM?
  2. In a cross-point memory with resistive elements placed at the intersections of row and column lines, which element is placed in series with the storage element to prevent current from sneaking through unselected cells?
  3. Which is a characteristic of a FeFET, which uses a ferroelectric as the gate insulator?
  4. In phase-change memory (PCM), what is the phenomenon in which the resistance of the amorphous state gradually increases over time?
  5. How is data read from MRAM?