Figures & data
Figure 1. Firing voltage Vf, sustain voltage Vs, and memory coefficient MC of the MgO films as a function of the aging temperatures of the substrate Citation4.
Figure 2. XPS wide-scan spectra of the MgO films at three different aging temperatures: (a) 25°C; (b) 100°C; and (c) 150°C Citation4.
Figure 3. XPS O1s narrow-scan spectra of the MgO films at three different aging temperatures (25°C, 100°C, and 150°C) compared with the pre-aging sample (As-dep) Citation4.
Figure 4. Supercell structure for the MgO (100) surface model with seven atomic layers. The light-colored (green) ball is Mg, and the dark-colored (red) one is O. The thickness of the vacuum slab was set to 12.9 Å (color online).
Figure 5. DOSs of the (a) bulk MgO crystal Citation7 and (b) clean MgO (100) surface without contaminations in full scale.
Figure 6. PDOS of the C-adsorbed MgO (100) surface: (a) C-adsorbed first layer; (b) bulk-like fourth layer; and (c) clean surface of the seventh layer.
Figure 7. PDOS of the H-adsorbed MgO (100) surface: (a) H-adsorbed first layer; (b) bulk-like fourth layer; and (c) clean surface of the seventh layer.
Figure 8. Geometry-optimized atomic structure of the (a) C- and (b) H-adsorbed MgO (100) surfaces (color online).
