Abstract
Electric transport through ultrathin CoFe2O4 (CFO) films of different thicknesses is studied using current sensing atomic force microscopy. Analysis of current distribution maps and I-V characteristics reveals anomalous thickness dependence. Results indicate the existence of an Ohmic conduction channel in parallel with the tunnel one. The origin of the nontunneling, likely non-spin-preserving, channel is discussed in the context of recent results on spin-filtering CFO-based devices.
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