Berlin 2012 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques
DF 9.13: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Magnetoresistance properties of Fe3O4 nanoparticles in a Cu matrix — •Sergej A. Nepijko1, Dmytro Kutnyakhov1, Maxym Demydenko2, Serhiy Protsenko2, Dmytro Kostyuk2, and Gerd Schönhense1 — 1Institute of Physics, University of Mainz, 55099, Mainz, Germany — 2Sumy State University, 40007, Sumy, Ukraine
The aim of the work was the manufacturing of ordered arrays of magnetic Fe3O4 nanoparticles, the investigation of their structural and phase state and magneto-resistance in a wide range of annealing temperatures. Nanoparticles were prepared by chemical synthesis and drop deposited onto a Si substrate. After deposition the ordered nanoparticle array was observed by TEM. Nanoparticle sizes changed from 6.0 nm (as deposited) to 11.6 nm (after annealing at 1200 K). The phase state of the nanoparticles was cubic (spinel type) with lattice parameter varying from 0.811 nm (as-deposited) to 0.840 nm (1200 K). The magnetoresistance was measured using nanostructured systems of Au(2nm)/Cu(20nm)/Fe3O4(nanoparticles)/SiO2/Si with varying the angle between magnetic field direction and substrate plane from 0∘ to 90∘. The resulted maximum value of magnetoresistance was about 2 %.