Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.82: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Investigation of iron - iron oxide core shell nanoparticles with XAS and XMCD — •Kai Fauth^1,2, Luise Theil Hansen³, Eberhard Goering², and Gisela Schütz² — ¹Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg — ²MPI für Metallforschung, Heisenbergstraße 1, 70569 Stuttgart — ³Risø National Laboratory, Materials Research Dpt., Frederiksborgvej, DK-4000 Roskilde

We present x-ray absorption and magnetic circular dichroism studies of cuboidal, iron nanoparticles passivated by an iron oxide shell. The combination of measurements with different probing depths allows the determination of the oxide composition. The magnetic data (0≤ B ≤ 7 T) reveal the magnetic interactions across the interface between the α-Fe core and the ferrimagnetic iron oxide shell. We observe a strong, predominantly ferromagnetic core shell exchange coupling. The canted spin structure of the oxide shell is therefore also reflected by the magnetic response on the metallic side of the interface. As a result, the remanent magnetization is reduced to below detection threshold.