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Magnetic moment of Fe in oxide-free FePt nanoparticles
Abstract and Figures
We present results of x-ray absorption spectroscopy and x-ray magnetic circular dichroism investigations at the L-3,L-2 edges of Fe in FePt nanoparticles. Plasma treated, oxide-free FePt nanoparticles with a high degree of L1(0) ordering and a mean diameter of about 6 nm were produced by gas phase condensation followed by in situ flight annealing. The presence of the L1(0) phase is observed by high resolution transmission electron microscopy. Compared to chemically disordered A1 FePt particles of similar size and composition, we find a fourfold enhanced orbital magnetic moment mu(L)=0.19 (+/- 0.04)mu(B), a nearly unchanged effective spin magnetic moment mu(eff)(S)=2.21 (+/- 0.24)mu(B) and a 2% increase in the white-line ratio of the L-3 and L-2 Fe edges. Nevertheless, the room temperature coercive field amounts to mu H-0(C)=38(+/- 7) mT only. These results are discussed in relation to possible effects of chemical order and surface anisotropy.
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