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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.43: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Magnetic properties of Fe90Sc10 nanoglass — •Ralf Witte1,2, Jixiang Fang2, Mohammad Ghafari2, Robert Kruk2, Richard A. Brand2, Horst Hahn2, and Herbert Gleiter2 — 1Technische Universität Darmstadt, Gemeinschaftslabor Nanomaterialien, Petersenstr. 23, D-64287 Darmstadt, Germany — 2Karlsruher Institut für Technologie, Institut für Nanotechnologie, D-76344 Eggenstein-Leopoldshafen Germany
We report on our work on magnetic properties and their correlation with local structure in Fe-Sc nanoglasses. Samples were synthesized with a nominal composition of Fe90Sc10 in an inert-gas condensation (IGC) process. X-ray diffraction, Mössbauer spectroscopy as well as magnetometric characterization methods were applied to characterize the samples. Magnetometric measurements revealed a significant change of magnetic properties in the Fe rich compound marked by an increase of the Curie point to temperatures well above 300 K, which is much higher than the transition temperature in regular metallic glasses of similar composition. The maximum magnetic hyperfine field obtained from low temperature Mössbauer spectroscopy was about 37.5 T, which is much more than observed in bcc-Fe. This newly identified ferromagnetic phase is attributed to the modified short-range-order in the interfaces of adjacent amorphous nanoparticles.