Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.85: Poster

Tuesday, March 27, 2007, 15:00–19:00, Poster A

Synthesis of magnetic nanoparticles with pronounced shape anisotropy and characterisation via small angle x-ray scattering — •Frank Döbrich, Andreas Michels, and Rainer Birringer — Universität des Saarlandes, Technische Physik, Geb. D22, 66041 Saarbrücken, Germany

Ferrofluids (FF) are stable colloidal suspensions of magnetic particles in a nonmagnetic carrier fluid. This fact renders a FF sensitive to an external magnetic field, which leads to a coupling of magnetic and rheological properties. A prominent example is the magnetoviscous effect, i.e. the increase of the FF's viscosity due to an externally applied magnetic field. It is expected that a dispersion of highly anisometric particles such as rods or chains reveals a large enhancement (compared to spherical particles) of the magnetoviscous effect. This contribution reports on the synthesis of a highly anisometric FF containing stable chains of iron nanoparticles and on the microstructural characterization by means of transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). The SAXS measurements develop a pronounced anisotropy of the scattering pattern as a function of increasing external magnetic field. Evaluation of the radially averaged SAXS curves in terms of basic scattering functions is discussed.