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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.109: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Measurement of the viscosity with magnetic microparticles — •Nils Mellech, Michael Schilling, Andreas Hütten, and Günter Reiss — Department of Physics, Bielefeld University, Universitätsstr. 25, 33615 Bielefeld

Magnetic microparticles, which are commercial available in different configurations, can be transported to magnetic sensors through a microfluidic system. In the vicinity of the sensors they can be manipulated by external magnetic fields. XMR-sensors are patterned on a wafer with laser lithography and covered by a protective SiO₂-layer. A sensor-array, directly below the microchannels, measures the movement of the magnetic particles, which flow in a solvent over the sensors. Because the movement depends on the applied external magnetic field as well as on the viscosity of the solvent, exact measurements of the viscosity can be done.