Abstract
We have measured the derivative conductance spectra of magnetic tunnel junctions with fully epitaxial bcc-Co electrodes and MgO barrier layers of various thicknesses. For all samples, clear peaks, caused by a minority Δ1 band in the bcc Co(001) electrodes, were observed at around 0.5 V. Below 0.7 V, the dI/dV spectra are essentially independent of the barrier layer thickness indicating the absence of scattering of any significance in the barrier layer and the validity of the coherent tunneling description in the single crystalline structure. Above 0.7 V, the spectra depend on the MgO barrier layer thickness. The contribution made to the conductivity by the intrinsic electronic structure in the MgO layer is discussed.
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