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Detection and susceptibility measurements of a single Dynal bead
Journal of Applied Physics
In this work we present detection and susceptibility measurement experiments on a single superparamagnetic Dynal bead with a diameter of 1 lm and a magnetic moment of _ 4 _ 108lB. Accurate bead positioning was achieved via non-invasive AFM nanomanipulation. The detection and magnetic characterization of the bead were performed using ultra-sensitive InSb Hall devices. Single bead detection was demonstrated using a step-wise change of the dc magnetic field; measurements were performed using onlydoi:10.1063/1.3638124 fatcat:5gsuc7f4ozfp5mqx7quxxgy5bm