Structure and magnetic properties of iron–platinum particles with γ-ferric-oxide shell

被引：0
作者：
L. Basit
S. A. Nepijko
I. Shukoor
V. Ksenofontov
M. Klimenkov
G. H. Fecher
G. Schönhense
W. Tremel
C. Felser
机构：
[1] Johannes Gutenberg-Universität Mainz,Institut für Anorganische und Analytische Chemie
[2] Johannes Gutenberg-Universität Mainz,Institut für Physik
[3] Forschungszentrum Karlsruhe GmbH,Institut für Materialforschung I
来源：
Applied Physics A | 2009年 / 94卷
关键词：
07.78.+s; 29.30.Dn; 36.40.Cg; 61.05.Qr; 75.50.Bb;
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摘要：
Nanoparticles of solid solution FexPt1−x, where 0.25≥x≥0 ( fcc lattice) with γ-Fe2O3 shell (lattice of the spinel type) were synthesised and characterised by high-resolution transmission electron microscopy, energy dispersive X-ray analysis, electron energy loss spectroscopy, Mössbauer spectroscopy and magnetometry. From the point of view of magnetic properties, such two-phase particles are interesting because their core is antiferromagnetic or paramagnetic (at very small values of x) whereas the shell is ferrimagnetic. The size of the particles was in the range of several nanometers. The Mössbauer measurements revealed a blocking temperature of about 100 K above which the particles are superparamagnetic. Towards lower temperatures, the magnetic characteristics of an ensemble of such particles show an increase of magnetic rigidity.
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