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Magnetic nanoparticles (MNPs) have many applications which require MNPs to becaptured and immobilized for their manipulation and sensing. For example, MNPsensors based on detecting changes to the ferromagnetic resonances of anantidot nanostructure exhibit better performance when the nanoparticles arecaptured within the antidot inclusions. This study investigates the influenceof microfluidics upon the capture of MNPs by four geometries of antidot arraynanostructures hollowed into 30 nm-thick Permalloy films. The nanostructureswere exposed to a dispersion of 130 nm MNP clusters which passed through PDMSmicrofluidic channels with a 400 {\mu}m circular cross-section fabricated fromwire molds. With the microfluidic flow of MNPs, the capture efficiency - theratio between the number of nanoparticles captured inside of the antidotinclusions to the number outside the inclusions - decreased for all fourgeometries compared to previous results introducing the particles via dropletson the film surface. This indicates that most MNPs were passing over thenanostructures, since there were no significant magnetophoretic forces actingupon the particles. However, when a static magnetic field is applied, themagnetophoretic forces generated by the nanostructure are stronger and thecapture efficiencies are significantly higher than those obtained usingdroplets. In particular, circular antidots demonstrated the highest captureefficiency among the four geometries of almost 83.1% when the magnetic field isparallel to the film plane. In a magnetic field perpendicular to the film, thecircle antidots again show the highest capture efficiency of about 77%. Theseresults suggest that the proportion of nanoparticles captured inside antidotinclusions is highest under a parallel magnetic field. Clearly, the geometry ofthe nanostructure has a strong influence on the capture of MNPs.

External magnetic fields enhance capture of magnetic nanoparticles flowing through molded microfluidic channels by ferromagnetic nanostructures