X-Ray Magnetic Circular Dichroism Studies of FeRh Nanoparticles

Fe x Rh 100-x (x = 50, 80) nanoparticles (NPs) with an average diameter of ~2 nm were prepared by simultaneous decomposition of stoichiometric quantities of Fe[N(Si(CH 3 ) 3 ) 2 ] 2 and Rh(C 3 H 5 ) 3 using two different routes: 1) a standard hydrogenation procedure and 2) a new one based on use of...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-11, Vol.44 (11), p.2776-2779
Main Authors: Smekhova, A., Ciuculescu, D., Lecante, P., Wilhelm, F., Amiens, C., Rogalev, A., Chaudret, B.
Format: Article
Language:English
Subjects:
Chemical composition
Chemical elements
Cross-disciplinary physics: materials science
rheology
Dichroism
Exact sciences and technology
Hydrogenation
Induced magnetic moment
Iron
Magnetic anisotropy
Magnetic moments
magnetic nanoparticles
Magnetic properties
Magnetism
Materials science
Nanoparticles
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Rhodium
Synchrotron radiation
Temperature dependence
X-ray magnetic circular dichroism
X-rays
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Summary:Fe x Rh 100-x (x = 50, 80) nanoparticles (NPs) with an average diameter of ~2 nm were prepared by simultaneous decomposition of stoichiometric quantities of Fe[N(Si(CH 3 ) 3 ) 2 ] 2 and Rh(C 3 H 5 ) 3 using two different routes: 1) a standard hydrogenation procedure and 2) a new one based on use of amino-borane as a reducing agent. All samples were found to be superparamagnetic with a blocking temperature below 10 K. Results of X-ray magnetic circular dichroism (XMCD) experiments at the Fe K-edge and the Rh L 2,3 edges have shown that not only iron but also rhodium atoms are magnetic as a result of hybridization of Fe 3d states with 4d states of Rh. The total induced magnetic moment of Rh atoms as well as its spin and orbital contributions are shown to depend on chemical composition of NP S and the preparation method.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2001991