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Non-contact atomic force microscopy: Stability criterion and dynamical responses of the shift of frequency and damping signal

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Academic year: 2021

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FIG. 1. Distortion of the resonance peak 共 a 兲 and phase 关 curve a in 共 b 兲兴 vs the frequency for an OTCS without CAG (F 0 ⫽1.38⫻10 ⫺ 10 N, Q⫽4750, D ⫽ 17 nm, f 0 ⫽ 147 305 Hz, and ␬ ⫽ 5 ⫻ 10 ⫺ 29 m 3 )
FIG. 3. Stability domain, i.e., integral gain I vs proportional gain P of CAG, for four different values of the distance D
FIG. 4. Shift in frequency ⌬ f 共 a 兲 and damping signal 共 b 兲 vs tip–surface distance D in the NC-AFM
FIG. 5. Transient responses of the shift in frequency and damping signal for a nondissipative force step

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