Magnetocaloric Effect in Magnetic Nanoparticle Systems: How to Choose the Best Magnetic Material?
Authors: Serantes, D.; Baldomir, D.; Pereiro, M.; Botana, J.; Prida, V. M.; Hernando, B.; Arias, J. E.; Rivas, J.
Source: Journal of Nanoscience and Nanotechnology, Volume 10, Number 4, April 2010 , pp. 2512-2517(6)
Publisher: American Scientific Publishers
Abstract:Magnetic nanoparticles with controlled magnetocaloric properties are a good candidate to lower the temperature of nanosized systems: they are easy to manipulate and to distribute into different geometries, as wires or planes. Using a Monte Carlo technique we study the entropy change and refrigerant capacity of an assembly of fine magnetic particles as a function of their anisotropy and magnetization, key-parameters of the magnetic behavior of the system. We focus our attention on the anisotropy energy/dipolar energy ratio by means of the related parameter c0 = 2K/M2S, where K is the anisotropy constant and MS is the saturation magnetization of the nanoparticles. Making to vary the value of c0 parameter by choosing different K-MS combinations, allows us to discuss how the magnetocaloric response of an assembly of magnetic nanoparticles may be tuned by an appropriate choice of the magnetic material composition.
Document Type: Research Article
Publication date: 2010-04-01
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