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(a) Change in the sensor voltage with accumulation of superparamagnetic Nanomag-D beads on the micro-conductor with respect to the normalized time (t assumed zero at the beginning of the measurement); (b) Relative change in the voltage across the GMR sensor head due to the presence of various concentrations of Nanomag-D beads on the microconductor (MC) (Reproduced with permission from [36]. The Royal Society of Chemistry, 2015.).
