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Estimating spontaneous magnetization from a mean field analysis of the magnetic entropy change

AuthorsAmaral, J. S.; Silva, Nuno Joâo O.; Amaral, Vitor S.
Issue Date2010
CitationJournal of Magnetism and Magnetic Materials 322: 1569-1571 (2010)
AbstractThe magnetocaloric effect is a common property of all magnetic systems, corresponding to a temperature change under adiabatic conditions (ΔTad) or achange in magneticentropy in isothermal conditions (ΔSM), for a given applied magneticfieldchange. ΔTad can be directly measured under adiabatic conditions and indirectly estimated from specific heat measurements. ΔSM can be indirectly estimated from specific heat measurements or magnetization measurements (the usual approach). Early work on the study of ferromagnets used direct measurements of ΔTad to determine the spontaneousmagnetization for a given temperature value. In this work, we use ΔSM obtained from isothermal magnetization measurements to estimate the spontaneousmagnetization, comparing this result to mean-field fittings from a novel scaling method, discussing the validity and usefulness of this approach from considerations from the Landau theory of phase transitions.
Identifiersdoi: 10.1016/j.jmmm.2009.09.024
issn: 0304-8853
Appears in Collections:(ICMA) Artículos
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