Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Magnetic nanoparticles (joint session MA/CPP)

CPP 6.7: Talk

Monday, March 12, 2018, 11:15–11:30, H 0112

Determination of individual magnetic moments of trapped superparamagnetic particles — •Ulrich Herr, Meng Li, Benjamin Riedmüller, Florian Ostermaier, and Sruthi Sunder — Institute of Micro- and Nanomaterials, Ulm University, Ulm

Superparamagnetic nanoparticles are used in lab-on-chip devices for detection of bio-analytes, drug delivery, or in hyperthermia. Many of these applications would benefit from precise knowledge of the magnetic moment of the individual nanoparticle, which may vary significantly between particles due to the statistical nature of the production process. We have recently demonstrated that individual magnetic particles (Dynabeads M-280 and MyOne T1) can be trapped over long times in a micro-conductor ring combined with an additional homogeneous magnetic field [1], which allows precise determination of a variety of microscopic parameters. Here we demonstrate that capturing more than one particle inside the trap can lead to stable arrangement of the particles inside the magnetic potential landscape of the trap. By measuring the average distance between the nanoparticles in a known trap potential we are able to determine the actual magnetic moment of the trapped nanoparticles, which can not easily be obtained in other ways.

[1] B. Riedmüller, F. Ostermaier, F., U. Herr, Trapping of superparamagnetic particles with a single current-conducting micro-ring, IEEE Transactions on Magnetics 53 (2017) 5300706 DOI: 10.1109/TMAG.2017.2697722