Figure 4.

The spectra for reference samples [Si (100), Si (111), Al2O3 (0001), and diamond (100)] and hard disk samples [6 nm-DLC (Sputter), 10 nm-DLC (CVD) and Co-Cr alloy (hard disk without DLC)].

Muraoka and Komatsu Nanoscale Res Lett 2011 6:33   doi:10.1007/s11671-010-9778-8