Texture-induced magnetic interactions in ferrofluids

resumo

We report a method for reversibly controlling the strength of dipole-dipole interactions in maghemite ferrofluids. In order to induce some magnetic texture, the ferrofluid is exposed to a strong magnetic field while it is cooled from room temperature to below its freezing temperature. The experimental data show that the average strength of dipolar interactions increases with increasing texture and that the magnetic relaxation becomes slower. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4709725]

palavras-chave

PARTICLE SYSTEM; INTERPARTICLE INTERACTIONS; NANOPARTICLE ASSEMBLIES; RELAXATION-TIME; FIELD; ANISOTROPY; SUSCEPTIBILITY; TEMPERATURE; DYNAMICS; MODELS

categoria

Physics

autores

Urtizberea, A; Arizaga, A; Silva, NJO; Millan, A; Palacio, F; Luis, F

nossos autores

agradecimentos

This work has been funded by the Spanish MICINN and FEDER, Projects Nos. MAT2007-61621, MAT2009-13977-C03 (MOLCHIP), and CONSOLIDER-INGENIO CSD 2007-00010. A. U. and A. A. thank the European Network MAGMANet and the Spanish MICINN (FPI program), respectively, for their scholarships. We acknowledge Labor. Llum Sincrotro for beamtime allocation on BM16-CRG at ESRF in Grenoble. The authors acknowledge F. Fauth for his assistance with the SAXS measurements.

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