Dresden 2003 – scientific programme
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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
Tuesday, March 25, 2003, 15:15–19:15, Zelt
Investigation of iron - iron oxide core shell nanoparticles with XAS and XMCD — •Kai Fauth1,2, 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.