Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002njph....4...77z&link_type=abstract
New Journal of Physics, Volume 4, Issue 1, pp. 77 (2002).
Physics
2
Scientific paper
The influence of size reduction on the magnetism of CoRh has been studied on a system of spherical bimetallic nanoparticles embedded in a polymer matrix. By varying the concentration and the nature of the polymer, we achieved the chemical synthesis of different sizes from 1.7 to 4.1 nm from organometallic precursors. Pulsed fields up to 30 T were used in order to approach the magnetic saturation MS. Particles with a mean diameter of 1.7 nm display a value of 2.38 µB per CoRh unit, strongly enhanced compared to values calculated or measured on a bulk alloy. For all samples, the magnetic moment per atom and the effective anisotropy constant are found to decrease with size but are still enhanced compared to bulk values. These results were interpreted as first evidence of the cooperative role of both alloying and size reduction in the enhancement of the magnetization and the anisotropy in this system associating a three-dimensional ferromagnetic metal with a 4d metal.
Amiens C.
Casanove M.-J.
Chaudret Bruno
Fromen M.-C.
Lecante P.
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