Memorias de investigación
Artículos en revistas:
Coexistence of ferromagnetism and spin glass state in YbNi2 nanoparticles
Año:2019
Áreas de investigación
  • Magnetismo
Datos
Descripción
We report changes on the magnetic behavior of the Heavy-Fermion ferromagnetic YbNi2 alloy when reducing the size of the particles to the nanometer scale by high-energy ball milling. The milling process induces a reduction on the particle size of the bulk alloy down to 10 (2) nm and a lattice strain of 1.8 (2)%, for 30 h of milling time, as calculated from the X-ray diffraction data. The ferromagnetic transition at TC = 10.5 K in the bulk alloy tends to disappear whereas other magnetic transitions arise at lower temperatures with the milling process. The AC magnetic susceptibility of the 30 h milled sample shows a frequency independent peak at 3 K, in a wide range of frequencies, consistent neither with superparamagnetic nor simple freezing of the magnetic moments, and as expected for a ferromagnetic behavior. However, from the specific heat measurements in the 30 h milled sample, a peak at 3.6 K is shifted respect to that observed in the AC magnetic susceptibility, as found in spin glasses. The results are explained by the influence of magnetic inhomogeneities and disorder of the alloys enhanced by the milling process in the ensemble of nanoparticles.
Internacional
Si
JCR del ISI
Si
Título de la revista
Journal of Magnetism And Magnetic Materials
ISSN
0304-8853
Factor de impacto JCR
3,046
Información de impacto
Datos JCR del año 2017
Volumen
475
DOI
10.1016/j.jmmm.2018.11.123
Número de revista
Desde la página
264
Hasta la página
270
Mes
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  • Creador: Grupo de Investigación: Acústica Arquitectónica
  • Departamento: Estructuras y Física de Edificación