Figure 5
Al-O coordination in the aluminium oxide barrier in the Al/AlOx/Al junction.
(a) the refined atomic structure model of aluminium oxide tunnel barrier with the visualization of Al (coloured)–O (grey) coordination. Al atoms with different colours have different O coordination numbers. Dashed lines indicate the positions of the Al/AlOx interfaces. The profile of 2 Å-column averaged coordination number of Al atoms across the AlOx barrier is shown below the atomic structure model. The coordination number is averaged along the direction parallel to the Al/AlOx interfaces and with a 2 Å step along the direction perpendicular to the interfaces. (b) Al-O coordination number distribution in the barrier oxide.
