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Contact effects in devices incorporating strongly-correlated electronicmaterials are comparatively unexplored. We have investigated theelectrically-driven phase transition in magnetite (100) thin films byfour-terminal methods. In the lateral configuration, the channel length is lessthan 2 $\mu$m, and voltage-probe wires $\sim$100 nm in width are directlypatterned within the channel. Multilead measurements quantitatively separatethe contributions of each electrode interface and the magnetite channel. Wedemonstrate that on the onset of the transition contact resistances at bothsource and drain electrodes and the resistance of magnetite channel decreaseabruptly. Temperature dependent electrical measurements below the Verweytemperature indicate thermally activated transport over the charge gap. Thebehavior of the magnetite system at a transition point is consistent with atheoretically predicted transition mechanism of charge gap closure by electricfield.

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