Interplay of bulk and interface effects in the electric-field-driven transition in magnetite

A. A. Fursina, R. G.S. Sofin, I. V. Shvets, D. Natelson

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Contact effects in devices incorporating strongly correlated electronic materials are comparatively unexplored. We have investigated the electrically driven phase transition in magnetite (100) thin films by four-terminal methods. In the lateral configuration, the channel length is less than 2μm, and voltage-probe wires ∼100nm in width are directly patterned within the channel. Multilead measurements quantitatively separate the contributions of each electrode interface and the magnetite channel. We demonstrate that on the onset of the transition contact resistances at both source and drain electrodes and the resistance of magnetite channel decrease abruptly. Temperature-dependent electrical measurements below the Verwey temperature indicate thermally activated transport over the charge gap. The behavior of the magnetite system at a transition point is consistent with a theoretically predicted transition mechanism of charge gap closure by electric field.

Original languageEnglish
Article number045123
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - Jan 25 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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