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Keywords:

  • Ferroelectric/multiferroic;
  • Terahertz spectroscopy;
  • Ultrafast dynamics;
  • Memory
Thumbnail image of graphical abstract

The crystallographic anisotropy in electromagnetic terahertz radiation from multiferroic BiFeO3 (100), (110), and (111) films suggests the ultrafast depolarization of ferroelectric order as a new mechanism of terahertz emission. This implies that the spontaneous polarization in ferroelectric materials can be manipulated in time scale of picoseconds, thus paving the way to ultrafast data-storage devices based on nonvolatile ferroelectric memories.