SCM signal measured on the Fe-deposited area and on the silicon surface. a. dC/dV-voltage plots at 10 and 90 kHz bias. b. Dependence of the amplitude of the dC/dV peak at about +5 V on the bias modulation frequencies.
Dózsa et al. Nanoscale Research Letters 2011 6:140 doi:10.1186/1556-276X-6-140