Enhanced Orbital Magnetism in Fe{sub 50}Pt{sub 50} Nanoparticles

Journal Article · Fri Sep 15 04:00:00 UTC 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.117201· OSTI ID:20860836

Antoniak, C; Lindner, J; Spasova, M; Sudfeld, D; Acet, M; Farle, M; Fauth, K; Wiedwald, U; Boyen, H -G; Ziemann, P; Wilhelm, F; Rogalev, A; Sun, Shouheng ^[1]

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1. Experimentalphysik--AG Farle, Fachbereich Physik, Universitaet Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg (Germany)

X-ray absorption and magnetic circular dichroism spectra at both the Fe and Pt L{sub 3,2} edges were measured on wet-chemically synthesized monodisperse Fe{sub 50}Pt{sub 50} particles with a mean diameter of 6.3 nm before and after complete removal of the organic ligands and the oxide shell covering the particles by soft hydrogen plasma resulting in a pure metallic state. After thermal treatment of the metallic particles, the coercive field increased by a factor of 6, the orbital magnetic moment at the Fe site increased by 330% and is reduced at the Pt site by 30%, while the effective spin moments did not change. A decrease of the frequency of oscillations in the extended x-ray absorption fine structure at the Pt L{sub 3,2} edges provides evidence for crystallographic changes towards the L1{sub 0} phase.

• OSTI ID: 20860836
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
CRYSTALLOGRAPHY
FINE STRUCTURE
HYDROGEN
IRON ALLOYS
LIGANDS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC MOMENTS
MAGNETISM
NANOSTRUCTURES
OXIDES
PARTICLES
PLASMA
PLATINUM ALLOYS
SPIN
X RADIATION