Self-assembly vicinal surface of Mo(001) grown on Al_2O_3(1102)

摘要

The structure and surface morphology of self-assembly vicinal surfaces (SAVSs) of Mo epitaxially grown on Al_2O_3(1102) substrates have been investigated by reflective high energy electron diffraction and scanning tunneling microscopy. The terrace edges for the Mo(001) SAVS are mainly arranged along [110]_(Mo)‖[1120]_(Al_2O_3) with a narrow distribution terrace width. The structural analyses show that the formation of the SAVS is due to a tilt growth of Mo(001) plane with respect to Al_2O_3(1102) substrate. By a simple geometric model, the tilt growth and SAVS of Mo(001) can be attributed to the asymmetric lattice mismatch between Mo(001) and Al_2O_3(1102) surfaces.