Table 1. The measured and calculated signals per particle for different MNPs^a.

MNPs (diameter)	Ms (10−16 emu)	M30 Oe (10−16 emu)	A1 (10−18 emu/(nm)1.3)	A2 (10−20 emu/(nm)1.3)	B (Measured Signal,10−6 μV)
10 nm	0.82	0.02	0.38	0.94	2.42
20 nm	7.8	1.1	3.3	46.5	15.1
30 nm	10.8	1.05	4.16	40.43	22.1
50 nm	81	23	26.33	747.77	177.08
100 nm	368	18	84.65	414.07	305.56

^aAll the values listed above are calculated for one particle. The measured signal per MNP (B) is calculated from bound numbers of MNPs, size of sensor (120 × 120 μm), and measured signal. We statistically assume that all the MNPs are ideally bound uniformly and every MNP has the same contribution to signal. A1 = Ms/(radius + 57 nm)^1.3, A2 = M_{30 Oe}/(radius + 57 nm)^1.3. It is assumed that the bound number for the 10 nm MNPs is 230/μm².