Design of Harmonic AFM Probe Subjected to van der Waals Force in the Modified Couple Stress Theory

Table 3

Comparison of the dimensionless frequencies determined by the proposed probe and similarity formula (46) at the tip-sample distance D₀ = 5 nm (, ξ₁ = 0.3, ξ₂ = 0.6, 1.096436, , , , , D₀ = 5 nm, and ).

δ
		Proposed method	Equation (42)
0.0	2.8827	2.8827	2.8827	0.000	0.000
0.1	—	3.0234	3.0234	0.000	0.000
0.2	—	3.1578	3.1578	0.000	0.000
0.3	—	3.2867	3.2867	0.000	0.000
0.4	—	3.4108	3.4108	0.000	0.000
0.5	—	3.5305	3.5305	0.000	0.000
0.6	—	3.6463	3.6463	0.000	0.000
0.7	—	3.7585	3.7585	0.000	0.000
0.8	—	3.8675	3.8675	0.000	0.000
0.9	—	3.9735	3.9735	0.000	0.000
1.0	—	4.0767	4.0767	0.000	0.000