Abstract
Temperature-dependent fluctuations in the local current passing through close-packed magnetite nanocrystal (NC) films were probed by scanning tunneling microscopy. This phenomenon, which peaked near the blocking temperature $({T}_{\text{b}})$, reflects spin-polarized tunneling fluctuations due to NC magnetization switching events. The current exhibited telegraph noise patterns, switching between low and high states. Above ${T}_{\text{b}}$ both states occurred with equal probability while below it the high current state dominated, which is consistent with a superferromagnetic ground state where the NC moments are aligned.
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