Intrinsic ferroelectricity in charge-ordered magnetite

Manuel Angst, Shilpa Adiga, Semen Gorfman, Michael Ziolkowski, Jörg Strempfer, Christoph Grams, Manuel Pietsch, Joachim Hemberger

Research output: Contribution to journalArticlepeer-review

Abstract

Single crystalline magnetite Fe3O4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectric characteristics, with polarization switching observably only at sufficiently low temperatures and in a suitably chosen time-window. PUND measurements with a ms time scale indicate a switchable polarization of about 0.6 µC/cm2. Significant switching occurs only above a threshold field of about 3 kV/mm, and it occurs with a time delay of about 20 µs. The time-resolved diffraction experiment yields, for sufficiently high voltage pulses, a systematic variation by about 0.1% of the intensity of the (2, 2, 10) Bragg reflection, which is attributed to structural switching of domains of the non-centrosymmetric Cc structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite.

Original languageEnglish
Article number546
JournalCrystals
Volume9
Issue number11
DOIs
StatePublished - Nov 2019

Keywords

  • Charge order
  • Ferroelectric
  • Friedel mates
  • Magnetite
  • Multiferroic
  • PUND measurements
  • Resonant scattering
  • Time-resolved X-ray diffraction
  • Verwey transition

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