Измерение силы магнитного взаимодействия между массивом NdFeB микромагнитов и коллоидным зондом для МСМ; Перспективы развития фундаментальных наук
| Parent link: | Перспективы развития фундаментальных наук.— 2012.— [С. 192-194] |
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| Autor principal: | |
| Altres autors: | , |
| Sumari: | Заглавие с экрана The micromagnets have been fabricated to trap functional systems for the microfluidic application. In order to characterize in air the magnetic trap properties (spatial dimension and intensity) and its action on the well define system, the method to fix a polystyrene microsphere functionalized with iron nanoparticles to an AFM tip apex has been developed. Thanks to this custom-made colloidal probe, the long range attractive force related to the magnetic interaction has been probe in MFM mode where the microsphere is never in closed contact with the surface to avoid the formation of the capillary bridge as well as the short range forces. MFM characterisations have been performed on NdFeB sample with three different MFM probes: a classical MFM tip with soft magnetic coating, tip with hard magnetic CoPt/FePt coating and a custom-made colloidal magnetic AFM tip. It has been observed that the phase shift signal is stronger for the magnetic microsphere tip compared to the tip with CoPt/FePt coating and weaker compare to the classical MFM tip. Using standard values for the oscillation amplitude of the cantilever in MFM mode, the variation in trapping force intensity on the magnetic microsphere, as a function of the tip-surface distance, has been found to ranges from 0.02nN up to 0.16nN. |
| Idioma: | rus |
| Publicat: |
2012
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| Col·lecció: | Физика |
| Matèries: | |
| Accés en línia: | http://www.lib.tpu.ru/fulltext/c/2012/C21/061.pdf |
| Format: | Electrònic Capítol de llibre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=237191 |
| Descripció física: | 1 файл(550 Кб) |
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| Sumari: | Заглавие с экрана The micromagnets have been fabricated to trap functional systems for the microfluidic application. In order to characterize in air the magnetic trap properties (spatial dimension and intensity) and its action on the well define system, the method to fix a polystyrene microsphere functionalized with iron nanoparticles to an AFM tip apex has been developed. Thanks to this custom-made colloidal probe, the long range attractive force related to the magnetic interaction has been probe in MFM mode where the microsphere is never in closed contact with the surface to avoid the formation of the capillary bridge as well as the short range forces. MFM characterisations have been performed on NdFeB sample with three different MFM probes: a classical MFM tip with soft magnetic coating, tip with hard magnetic CoPt/FePt coating and a custom-made colloidal magnetic AFM tip. It has been observed that the phase shift signal is stronger for the magnetic microsphere tip compared to the tip with CoPt/FePt coating and weaker compare to the classical MFM tip. Using standard values for the oscillation amplitude of the cantilever in MFM mode, the variation in trapping force intensity on the magnetic microsphere, as a function of the tip-surface distance, has been found to ranges from 0.02nN up to 0.16nN. |