Measuring the Force Gradient Acting on a Magnetic Microsphere above a Micro-Magnet Array

Svetlana Ponomareva (1) , Luiz-Fernando Zanini (2) , Frédéric Dumas-Bouchiat (3) , Nora Dempsey (2) , Dominique Givord (2) , Florence Marchi (1)

1 NEEL - NOF - Nano-Optique et Forces
2 NEEL - MNM - Micro et NanoMagnétisme
3 Axe 2 : procédés de traitements de surface

The attractive action exerted by an array of micro-magnets on a single polystyrene microsphere containing superparamagnetic iron oxide nanoparticles, the microsphere constituting a model for cells functionalised with such nanoparticles, have been studied in air by using magnetic force microscopy. For this purpose, the method of gluing a magnetic microsphere to an AFM tip has been developed. Using this custom-made colloidal probe, the regions of the micro-magnet array that act as magnetic traps for the magnetic microsphere have been localized and the long-range trap-sphere interactions have been recorded, measured and compared with simulations.

Mots clés: Colloidal Probe Fabrication; Magnetic Force Microscopy; Micro-Magnet Array; Nanoscale Interaction Measurement

Domaines: Matériaux

Svetlana Ponomareva, Luiz-Fernando Zanini, Frédéric Dumas-Bouchiat, Nora Dempsey, Dominique Givord, et al.. Measuring the Force Gradient Acting on a Magnetic Microsphere above a Micro-Magnet Array. Advanced Materials Research, 2013, 872, pp.167-173. ⟨10.4028/www.scientific.net/AMR.872.167⟩. ⟨hal-00946218⟩