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Magnetocaloric effect in an ensemble of diluted magnetic nanoparticles
Author(s) -
Warda Krzysztof
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945542
Subject(s) - magnetic refrigeration , nanoparticle , condensed matter physics , magnetic nanoparticles , materials science , statistical physics , magnetic relaxation , entropy (arrow of time) , magnetization , relaxation (psychology) , dipole , thermodynamics , physics , nanotechnology , magnetic field , quantum mechanics , psychology , social psychology
A simple analytical model is presented in order to describe the magnetocaloric effect in an ensemble of magnetic nanoparticles. We confine our considerations to the case of a low concentration of nanoparticles, i.e. when the dipolar interaction among the particles can be neglected. The description of the behaviour of the nanoparticles is based on the Oguchi approach to the relaxation equation, which constitutes an alternative way of the description of magnetization and entropy change for the ensemble of weakly interacting nanoparticles.