title: Magnetocaloric effect in magnetic nanoparticle systems: how to choose the best magnetic material?
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/M(S)2, where K is the anisotropy constant and M(S) is the saturation magnetization of the nanoparticles. Making to vary the value of co parameter by choosing different K-M(S) 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.
authors.affiliation: Instituto de Investigacións Tecnolóxicas, Universidade de Santiago de Compostela, Galiza, E-15782, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Serantes
authors.forename: D
authors.initials: D
authors.lastname: Baldomir
authors.forename: M
authors.initials: M
authors.lastname: Pereiro
authors.forename: J
authors.initials: J
authors.lastname: Botana
authors.forename: V M
authors.initials: VM
authors.lastname: Prida
authors.forename: B
authors.initials: B
authors.lastname: Hernando
authors.forename: J E
authors.initials: JE
authors.lastname: Arias
authors.forename: J
authors.initials: J
authors.lastname: Rivas