Abstract
Measurements of tunnel current flow through normal metal junctions made with the ferromagnetic metals Fe, Ni, and Co have been carried out in the range 1°–300°K. The insulating layer has been an oxide of the above metals or aluminum oxide and the second metal either aluminum or silver. In the case of Fe-FeOx-Al a giant zero-bias anomaly corresponding to a resistance maximum has been observed at helium temperatures and this persists up to room temperature. Co-CoOx-Al also shows a similar but smaller anomaly while Ni-NiOx-Al shows an anomalous behavior of reverse sign. Data on the dynamic resistance as a function of voltage and temperature are presented in this paper. The effects of magnetic fields up to 50 kOe have also been studied.
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