Emerging memories

On the hysteresis loop (polarization versus electric field) of a ferroelectric, what is the polarization that remains when the field returns to zero called?

  1. ARemanent polarization
  2. BSaturation magnetization
  3. CBreakdown field
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Answer: A. Remanent polarization

The polarization that remains after a ferroelectric is polarized by a field and the field is returned to zero is called remanent polarization. FeRAM stores 0 and 1 as the direction (positive or negative) of this remanent polarization. The field needed to reverse the polarization is called the coercive field.

  • A. Correct. It is the polarization remaining at zero field.
  • B. Saturation magnetization relates to the magnetization of magnetic materials.
  • C. The breakdown field is the field at which an insulator fails.
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