Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 24: Magnetic Imaging and Scattering Techniques

MA 24.7: Vortrag

Mittwoch, 13. März 2013, 11:00–11:15, H22

Magneto-mechanical coupling of nickel nanorods with an elastic matrix studied by magneto-optical transmission measurements — •Christoph Schopphoven, Philipp Bender, Andreas Tschöpe, and Rainer Birringer — Universität des Saarlandes, Saarbrücken

The rotation of ferromagnetic nickel nanorods in a soft-elastic hydrogel matrix was investigated by magnetic field-dependent optical transmission of linearly polarized light. Nickel nanorods with an average diameter of 23nm and an average length of 125nm were prepared by pulsed electrodeposition of nickel into porous AAO-templates. Dissolution of the alumina layer in dilute NaOH with polyvinylpyrrolidone(PVP) added for steric stabilization and subsequent separation and purification resulted in a stable aqueous solution. The microstructure of the nanorods was characterized by electron microscopy and the magnetic properties were obtained through magnetization measurements. These rods were dispersed into gelatin sols at 60°C and cooled to room temperature. During gelation a homogeneous field was applied to align the rods in field direction. The rods were rotated by applying a field perpendicular to their orientation and the resulting rotation angle was determined through optical transmission measurements. These experimental results were used to calculate the shear modulus of the gelatin matrix and the energy transferred into elastic deformation of the hydrogel matrix.