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Optical absorption spectra of MgO(001)/MgO(50 nm) samples.
(a) Topographic map of MgO barrier in MgO layer and local tunneling maps with 1 V bias of (b) and (c) MgO layers. Topographic map in MgO layer is nearly the same with (a). The rms roughness of (a) is 0.14 nm.
(a) Distributions of local tunnel current from Figs. 2(b) and 2(c). Lines are the best fits with a logarithmic-normal distribution. (b) Distributions of topographic deviation from the nominal thickness of MgO barriers in and MgO layers. These distributions fit well with a Gaussian function, where the standard deviation is 0.26 and 0.25 for and MgO layers, respectively.
Current-voltage curves of and MgO layers, measured at hotspot and background using conductive tip.
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