INVESTIGADORES
ZYSLER Roberto Daniel
artículos
Título:
Magnetic order in amorphous (Fe0.25Nd0.75)0.6B0.4 nanoparticles
Autor/es:
M. TORTAROLO; R.D. ZYSLER; H. ROMERO
Revista:
JOURNAL OF APPLIED PHYSICS
Editorial:
AMER INST PHYSICS
Referencias:
Año: 2009 vol. 105 p. 113918 - 113918
ISSN:
0021-8979
Resumen:
We have synthesized and study the magnetic properties of (Fe0.25Nd0.75)0.6B0.4 amorphous nanoparticles. These particles were prepared in dispersed (polymeric matrix) and powder systems in order to investigate both the internal magnetic order of the particles and the effects arising from the interactions among them. The results obtained for the dispersed particles evidence the presence of an internal magnetic structure of the particles with a magnetically ordered core plus a paramagnetic shell. At low temperature, the core magnetic moment interacts with the shell (intraparticle interaction) inducing an enhancement in the effective magnetic anisotropy of the particles, which is related to the sharp increase in the coercive field at low temperatures. The interparticle interactions affect mainly the surface spins and induce a decrease in the total magnetization of the particle.
