Abstract
A nonlinear magnetic droplet in a flow-focusing channel is studied in this letter. The breakup regime of the droplets undergoes a transition from dripping to bifurcation to dripping. A GMR (giant magnetoresistance) sensor is proposed for droplet detection. When this nonlinear droplet passes, the sensor can produce a continuous jitter signal which is significantly different from the one obtained in the dripping mode. The MR (magnetoresistive) ratio is about 3.2%. The droplet magnetic field obtained by molecular dynamics simulation demonstrates that the GMR sensor is effective in the detection.
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