Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.54: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Electrophysical and magnetoresistivity properties of granular multilayers based on Co, Ag, Au and Cu — •Dmytro Kutnyakhov1, Sergej Nepijko1, Iryna Cheshko2, Larysa Odnodvorets2, Nataliya Shumakova2, Gerd Schönhense1, and Ivan Protsenko2 — 1Institute of Physics, University Mainz, 55099, Mainz, Germany — 2Sumy State University, 40007, Sumy, Ukraine
Aiming at a possible use as functional spintronics elements, we study the structural and electrical properties of thin films with spin-depending scattering of electrons based on Co nanoparticles embedded in a matrix of Ag, Au and Cu. Correlations of structure with electrophysical and magnetoresistive properties of these systems are shown, in particular for two- and multilayer films of metastable solid solutions (s.s.) of Ag/Co, Au/Co and Cu/Co. For the systems based on Cu/Co s.s. formed during condensation and partially disintegrated after annealing up to 700 K. For the systems based on Ag/Co or Au/Co s.s. formed during annealing near 700 K, whereas in non-annealed films no s.s. forms. In all systems grains of hcp-Co with 10 nm average size are observed. Formation of s.s. gives rise to change of resistivity, thermal coefficient of resistivity, gauge factor, and magnetoresistance. In the as-grown films no magnetoresistance was observed. After annealing up to 700 K a magnetoresistance of about 0.7% for Ag/Co and 0.4% for Au/Co systems was observed. This change was related with stabilization of granular state of hcp-Co in the matrix. Project funded by BMBF (UKR 08/022) and by Graduate School of Excellence MAINZ (D.K.)