Tunnel Contacts for Spin Injection into Silicon: The Si-Co Interface with and without a MgO Tunnel Barrier—A Study by High-Resolution Rutherford Backscattering
Figure 9
(a) HRBS spectra of a Si sample before and after MgO evaporation. Before evaporation: HRBS spectrum of the high-energy edge Si edge (solid circles) and RUMP simulation (solid line) of the clean Si. After MgO evaporation: HRBS spectrum at Si, Mg and O edges (open circles) and RUMP simulation (solid line) of the 23 ML MgO as prepared on a Si (100) surface. (b) HR-TEM cross-sectional micrograph of a Si (100)/MgO (23 ML)/Co structure.
