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MA: Fachverband Magnetismus
MA 8: Magnetic Particles/ Clusters I
MA 8.8: Talk
Monday, March 14, 2011, 16:30–16:45, HSZ 103
Magnetic and transport properties of Py/iron-oxide nanoparticle composite systems — •Philipp Szary1, Giovanni A. Badini Confalonieri1, Durgamadhab Mishra1, Maria Jose Benitez1,2, Mathias Feyen2, Anhui Lu2, Leonardo Agudo3, Gunther Eggeler3, Oleg Petracic1, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Max-Planck Institut für Kohlenforschung, D-45470 Mülheim an der Ruhr, Germany — 3Institut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, Germany
We have investigated the magnetic and electrical transport properties of Permalloy/iron-oxide nanoparticle-composite systems. Ultrathin films of Permalloy (Py) have been prepared by UHV ion beam sputtering and subsequently covered by one monolayer of iron-oxide nanoparticles. Post-annealing of the samples under controlled atmospheric conditions allows us to transform the particles into a mixed wüstite/magnetite (FexO/Fe3O4) phase [1]. Magnetometry measurements have been performed using superconducting quantum interference device (SQUID) magnetometry. M(H) magnetic hysteresis curves reveal a strong magnetic coupling between both subsystems. Moreover, magnetoresistance measurements were performed by contacting the Py layer. The results are consistent with the magnetometry data. We find that the presence of the nanoparticles significantly influences the magneto-transport behavior through the Py layer.
[1] M.J. Benitez et al., submitted (arXiv:1010.0938)