Magnetic moment of Fe in oxide-free FePt nanoparticles

被引：34

作者：

Dmitrieva, O.

Spasova, M.

Antoniak, C.

Acet, M.

Dumpich, G.

Kaestner, J.

Farle, M.

Fauth, K.

Wiedwald, U.

Boyen, H.-G.

Ziemann, P.

机构：

[1] Univ Duisburg Essen, Fachbereich Phys, Expt AG Farle, D-47048 Duisburg, Germany

[2] Univ Duisburg Essen, CeNIDE, D-47048 Duisburg, Germany

[3] Univ Wurzburg, Expt Phys 4, D-97074 Wurzburg, Germany

[4] MPI Met Forsch, D-70689 Stuttgart, Germany

[5] Univ Ulm, D-89069 Ulm, Germany

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.76.064414

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：7

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