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. Author manuscript; available in PMC: 2018 Jan 31.
Published in final edited form as: Chem Rev. 2015 Aug 10;115(19):10690–10724. doi: 10.1021/cr500698d

Figure 3. Magnetic susceptometer biosensor.

Figure 3

(a) A quadrature detector was developed to sense alternating current (AC) magnetic susceptibility in solution. PLL, phase-locked loop. (b) The peak in the magnetic susceptibility shifts with particle size. The magnetic responses of two differently sized MNPs were measured (red, 25-nm core; blue, 50-nm core). This information was used to distinguish the composition in the mixture (green). Reprinted with permission from Ref. 56. Copyright 2011 IOP Publishing Ltd.