Microwave response of anisotropic magnetorheological elastomers: Model and experiments

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We present ferromagnetic resonance measurements of Fe 3O 4 nanoparticles which have been dispersed in an elastomeric polymer [polydimethylsiloxane (PDMS)] at two different concentrations (5% and 15% w/w), and then cured in the presence of a uniform magnetic field. With this procedure it is possible...

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Detalles Bibliográficos
Autor principal: Butera, Alejandro Ricardo
Otros Autores: Ulvarez, N., Jorge, G., Ruiz, M.M, Mietta, J.L, Negri, R.M
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2012
Acceso en línea:Registro en Scopus
DOI
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Registro en la Biblioteca Digital
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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100 1 |a Butera, Alejandro Ricardo 
245 1 0 |a Microwave response of anisotropic magnetorheological elastomers: Model and experiments 
260 |c 2012 
270 1 0 |m Butera, A.; Centro Atómico Bariloche (CNEA), Instituto Balseiro (U. N. Cuyo), 8400 Bariloche, Río Negro, Argentina; email: butera@cab.cnea.gov.ar 
504 |a Coey, J.M.D., (2010) Magnetism and Magnetic Materials, , Cambridge University Press, Cambridge, UK 
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504 |a Mietta, J.L., Ruiz, M.M., Antonel, P.S., Pérez, O.E., Butera, A., Jorge, G., Negri, R.M., (2012) Langmuir, 28, p. 6985. , LANGD5 0743-7463 10.1021/la204823k 
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504 |a Bodziony, T., Guskos, N., Typek, J., Roslaniec, Z., Narkiewicz, U., Maryniak, M., (2004) Rev. Adv. Mater. Sci., 8, p. 86 
504 |a Butera, A., Kang, S.S., Nikles, D.E., Harrell, J.W., (2004) Physica B, 354, p. 108. , PHYBE3 0921-4526 10.1016/j.physb.2004.09.029 
504 |a Butera, A., Weston, J.L., Barnard, J.A., (2004) J. Magn. Magn. Mater., 284, p. 17. , JMMMDC 0304-8853 10.1016/j.jmmm.2004.06.015 
504 |a Curiale, J., Sánchez, R.D., Ramos, C.A., Leyva, A.G., Butera, A., (2008) J. Magn. Magn. Mater., 320, p. 218. , JMMMDC 0304-8853 10.1016/j.jmmm.2008.02.152 
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506 |2 openaire  |e Política editorial 
520 3 |a We present ferromagnetic resonance measurements of Fe 3O 4 nanoparticles which have been dispersed in an elastomeric polymer [polydimethylsiloxane (PDMS)] at two different concentrations (5% and 15% w/w), and then cured in the presence of a uniform magnetic field. With this procedure it is possible to align the particles forming unidimensional needlelike cylindrical agglomerates with a relatively high length/diameter ratio. The dynamical response of this nanostructured composite has been characterized using ferromagnetic resonance at K band (24GHz) and Q band (34 GHz). In both cases we have observed an anisotropic behavior in the resonance field when the external magnetic field is rotated from the direction of the needles to the perpendicular plane. However, the measured variation is considerably lower than the values expected for an array of perfectly homogeneous long cylinders in which the elongated shape causes a uniaxial anisotropy. Results have been analyzed using the standard Smit and Beljers formalism, considering a phenomenological shape factor, P, that accounts for the reduced anisotropy. Also an ellipticity factor in the cross section of the needles, r, and Gaussian fluctuations of the shape factor, σP, are needed to explain the observed angular variation of the linewidth. The values of these parameters are consistent with data obtained at K and Q bands, supporting the proposed model, although some differences have been found for the two studied concentrations. © 2012 American Physical Society.  |l eng 
593 |a Centro Atómico Bariloche (CNEA), Instituto Balseiro (U. N. Cuyo), 8400 Bariloche, Río Negro, Argentina 
593 |a Departamento Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina 
593 |a INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina 
593 |a Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Nanociencia y Nanotecnología, Argentina 
700 1 |a Ulvarez, N. 
700 1 |a Jorge, G. 
700 1 |a Ruiz, M.M. 
700 1 |a Mietta, J.L. 
700 1 |a Negri, R.M. 
773 0 |d 2012  |g v. 86  |k n. 14  |p Phys. Rev. B Condens. Matter Mater. Phys.  |x 10980121  |t Physical Review B - Condensed Matter and Materials Physics 
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