Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.30: Poster

Tuesday, March 17, 2015, 09:30–13:00, Poster A

Magnetic characterization of self-assembled arrays of magnetite nanoparticles — •Alexander Fabian¹, Matthias Thomas Elm¹, Hans-Albrecht Krug von Nidda², and Peter Jens Klar¹ — ¹I. Physikalisches Institut, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 — ²Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany

Magnetite (Fe₃O₄) is one of the oldest magnetic materials used by mankind. Its high spin polarization of nearly 100% at the Fermi-energy and its high Curie temperature of about 850 K makes it interesting for applications in miniaturized spintronic devices. Reducing the size of a bulk material to the nanoscale may strongly alter the magnetic properties. In order to build magnetic nanodevices using nanoparticles it is therefore not only necessary to arrange the nanoparticles in a controlled way, but also to investigate their magnetic properties as well as the interaction between them. Here we present a bottom up approach to arrange spherical shaped magnetite nanoparticles with a diameter of about 20 nm. For this purpose rectangular openings are written into PMMA resist by electron beam lithography. These openings are then filled during a horizontal dip coating process by using the meniscus force deposition method. Several arrangements with different aspect ratios are prepared. The arrangements were characterized by SQUID measurements showing a superparamagnetic behavior of the nanoparticles. Additionally nanoparticle thin films were investigated by ferromagnetic resonance measurements showing typical spectra of magnetite.