Artículo
Anisotropy and relaxation processes of uniaxially oriented CoFe2O4 nanoparticles dispersed in PDMS
Antonel, Paula Soledad
; Negri, Ricardo Martin
; Leyva de Guglielmino, Ana Gabriela; Jorge, Guillermo Antonio
Fecha de publicación:
08/2012
Editorial:
Elsevier Science
Revista:
Physica B: Condensed Matter
ISSN:
0921-4526
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
When a uniaxial magnetic field is applied to a non-magnetic dispersive medium filled with magnetic nanoparticles, they auto-assemble into thin needles parallel to the field direction, due to the strong dipolar interaction among them. We have prepared in this way magnetically oriented nanocomposites of nanometer-size CoFe 2O 4 particles in a polydimethylsiloxane polymer matrix, with 10% w/w of magnetic particles. We present the characteristic magnetic relaxation curves measured after the application of a magnetic field forming an angle α with respect to the needle direction. We show that the magnetic viscosity (calculated from the logarithmic relaxation curves) as a function of α presents a minimum at α=0, indicating slower relaxation processes associated with this configuration of fields. The results seems to point out that the local magnetic anisotropy of the nanoparticles is oriented along the needles, resulting in the macroscopic magnetic anisotropy observed in our measurements.
Palabras clave:
Magnetic Anisotropy
,
Magnetic Viscosity
,
Magnetoelastomers
,
Relaxation
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Articulos(INQUIMAE)
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Citación
Antonel, Paula Soledad; Negri, Ricardo Martin; Leyva de Guglielmino, Ana Gabriela; Jorge, Guillermo Antonio; Anisotropy and relaxation processes of uniaxially oriented CoFe2O4 nanoparticles dispersed in PDMS; Elsevier Science; Physica B: Condensed Matter; 407; 16; 8-2012; 3165-3167
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