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Magnetic relaxation of gamma-Fe2O3 nanoparticles arrangements and electronic phase-segregated systems

Hoppe, C. E. and Rivadulla, F. and Vidal-Vidal, J. and Lopez-Quintela, M. A. and Rivas, J. (2008) Magnetic relaxation of gamma-Fe2O3 nanoparticles arrangements and electronic phase-segregated systems. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8 (6). pp. 2883-2890.

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Abstract

gamma-Fe2O3 nanoparticles have been synthesized and dispersed in a polymeric matrix, forming a series of composites with different concentrations of magnetic particles. The effect of volume polydispersity and dipolar interactions on the relaxation behavior is discussed. We have paid special attention to the dynamic approach to discuss a possible true superspin-glass transition in highly concentrated composites. To avoid the practical limitations that appear in highly concentrated systems of particles, like the formation of aggregates, etc., we have studied the glassy phase that appears spontaneously in certain strongly electronic correlated materials close to a metal-insulator transition. It must be emphasized that from a theoretical point of view these inhomogenous magnetic states could present important advantages over classical dispersions of particles, like field-control of the effective particle size. The results are compared with other recently obtained for classical systems of particles.

Item Type:Article
Uncontrolled Keywords:nanoparticles; magnetic relaxation; spin-glass; phase segregation
Subjects:Physical Science > Nanophysics
Physical Science > Nanomagnetics
Material Science > Nanostructured materials
ID Code:1327
Deposited By:Anuj Seth
Deposited On:09 Dec 2008 16:58
Last Modified:09 Dec 2008 16:58

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