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Abstract:

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. © 2011 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Anisotropy and relaxation processes of uniaxially oriented CoFe 2O 4 nanoparticles dispersed in PDMS
Autor:Antonel, P.S.; Negri, R.M.; Leyva, A.G.; Jorge, G.A.
Filiación:Instituto de Química Física de Materiales, Ambiente y Energía (INQUIMAE), Departamento de Química Inorgánica, Analítica y Química Física, Pabellón II, Av. Cantilo s/n (1428), Buenos Aires, Argentina
Grupo de Materia Condensada, Gerencia de Investigación y Aplicaciones, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Avda. Gral. Paz 1499, 1650 San Martin, Pcia. de Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Av. Cantilo s/n (1428), Buenos Aires, Argentina
Palabras clave:Magnetic anisotropy; Magnetic viscosity; Magnetoelastomers; Relaxation; Dipolar interaction; Dispersive medium; Field directions; Local magnetic anisotropy; Logarithmic relaxation; Magnetic nanoparticles; Magnetic particle; Magnetic viscosity; Magnetoelastomers; Nanometer size; Nonmagnetics; Polydimethylsiloxane polymers; Relaxation; Magnetic anisotropy; Magnetic fields; Needles; Relaxation processes; Silicones; Nanoparticles
Año:2012
Volumen:407
Número:16
Página de inicio:3165
Página de fin:3167
DOI: http://dx.doi.org/10.1016/j.physb.2011.12.054
Título revista:Physica B: Condensed Matter
Título revista abreviado:Phys B Condens Matter
ISSN:09214526
CODEN:PHYBE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09214526_v407_n16_p3165_Antonel

Referencias:

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Citas:

---------- APA ----------
Antonel, P.S., Negri, R.M., Leyva, A.G. & Jorge, G.A. (2012) . Anisotropy and relaxation processes of uniaxially oriented CoFe 2O 4 nanoparticles dispersed in PDMS. Physica B: Condensed Matter, 407(16), 3165-3167.
http://dx.doi.org/10.1016/j.physb.2011.12.054
---------- CHICAGO ----------
Antonel, P.S., Negri, R.M., Leyva, A.G., Jorge, G.A. "Anisotropy and relaxation processes of uniaxially oriented CoFe 2O 4 nanoparticles dispersed in PDMS" . Physica B: Condensed Matter 407, no. 16 (2012) : 3165-3167.
http://dx.doi.org/10.1016/j.physb.2011.12.054
---------- MLA ----------
Antonel, P.S., Negri, R.M., Leyva, A.G., Jorge, G.A. "Anisotropy and relaxation processes of uniaxially oriented CoFe 2O 4 nanoparticles dispersed in PDMS" . Physica B: Condensed Matter, vol. 407, no. 16, 2012, pp. 3165-3167.
http://dx.doi.org/10.1016/j.physb.2011.12.054
---------- VANCOUVER ----------
Antonel, P.S., Negri, R.M., Leyva, A.G., Jorge, G.A. Anisotropy and relaxation processes of uniaxially oriented CoFe 2O 4 nanoparticles dispersed in PDMS. Phys B Condens Matter. 2012;407(16):3165-3167.
http://dx.doi.org/10.1016/j.physb.2011.12.054