Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: 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
MA 20.10: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Hall effect in nanodimensional multilayers based on island films of Pd and Fe — •Sergej A. Nepijko1, Dmytro Kutnyakhov1, Olena Tkach2, Larysa Odnodvorets2, Ivan Protsenko2, and Gerd Schönhense1 — 1Institute of Physics, University of Mainz, 55099, Mainz, Germany — 2Sumy State University, 40007, Sumy, Ukraine
Nanodimensional n-layers systems of [Pd/Fe]n/SiO2/Si, where 3≤n≤10, were used to examine the Hall effect. Effective thickness of separate layers of Pd and Fe changed in the range from 0.4 to 1.4 nm (Pd) and from 0.6 to 0.9 nm (Fe). Electron microscopic studies indicate that the layers have island structure and their composition corresponds to fcc-Pd and bcc-Fe. Solid solutions of Pd-Fe with fct-lattice are formed only when the thickness of layers ≥ 3 nm and after annealing at ≥ 790 K. Measurement of Hall coefficient RH indicate that its value monotonically decreases with increasing number of layers n. For example, for multilayer Pd(1.1 nm)/Fe(0.9 nm) RH decreases from 5.5×10−9 m3/C (n=2) to 3.97×10−9 m3/C (n=10). A size dependence of RH is observed also at fixed Fe layer thickness and variable thickness of Pd. For multilayer [Pd(x)/Fe(0.6)]10 the Hall coefficient decreases from 4.80×10−9 m3/C to 3.69×10−9 m3/C while increasing the effective thickness of Pd from x= 0.4 to 1.4 nm.