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

Abstract:

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.

• Periodical: Advanced Materials Research (Volume 872)
• Pages: 167-173
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.872.167
• Online since: December 2013
• Authors: Svetlana Ponomareva, Luiz Fernando Zanini, Frédéric Dumas-Bouchiat, Nora M. Dempsey, Dominique Givord, Florence Marchi
• Keywords: Colloidal Probe Fabrication, Magnetic Force Microscopy, Micro-Magnet Array, Nanoscale Interaction Measurement

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