Analysis of individual magnetic particle motion near a chip surface

K. van Ommering, C.C.H. Lamers, J.H. Nieuwenhuis, L.J. IJzendoorn, van, M.W.J. Prins

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)
148 Downloads (Pure)

Abstract

We describe an analysis of the dynamics of individual superparamagnetic micro- and nanoparticles in order to quantify their magnetic properties and mobility near a chip surface. The particles are attracted to the chip surface by integrated microscopic current wires. We show that it is possible to accurately analyze particles with a diameter of about 1 µm by the magnetophoretic movement between current wires because of the very high field gradients. This reveals distinct differences in volume susceptibilities of particles with the same outer diameter. Smaller particles are characterized using the technique of confined Brownian motion analysis. By capturing 300 nm particles on a current wire with surface barriers or a focused shape, the magnetization of the particles can be measured with an accuracy better than 10%.
Original languageEnglish
Article number104905
Pages (from-to)104905-1/10
Number of pages10
JournalJournal of Applied Physics
Volume105
Issue number10
DOIs
Publication statusPublished - 2009

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