The influence of a minority magnetic phase on the field dependence of the magnetocaloric effect

Franco, V.; Caballero-Flores, R.; Conde, A.; Dong, Qin; Zhang, H.W.

doi:10.1016/j.jmmm.2008.10.034

Cited by 107 publications

(74 citation statements)

References 22 publications

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“…Indeed, the universal behavior of ⌬S M had been independently demonstrated for another TbCo 2 sample. 12 Panel d of Fig. 2 shows the result for DyCo 2 .…”

Section: Resultsmentioning

confidence: 99%

Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

et al. 2010

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A universal curve for the change in the magnetic entropy has been recently proposed for materials with second-order phase transitions. In this work we have studied the universal behavior of the magnetocaloric effect in the family of cobalt Laves phases, RCo 2 , and mixed manganites, La 2/3 ͑Ca x Sr ͑1−x͒ ͒ 1/3 MnO 3 , which exhibit first-and second-order phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve for materials with second-order phase transition as opposed to the first-order phase transition compounds, for which this collapse does not hold. This result suggests that the universal curve may be used as a further criterion to distinguish the order of the phase transition.

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“…Indeed, the universal behavior of ⌬S M had been independently demonstrated for another TbCo 2 sample. 12 Panel d of Fig. 2 shows the result for DyCo 2 .…”

Section: Resultsmentioning

confidence: 99%

Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

et al. 2010

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“…Some studies focus on the magnetocaloric properties in the vicinity of phase transition [21][22][23][24][25]. Another issue of interest is the existence of some universal relations for characteristics of magnetocaloric effect [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy—Magnetocaloric point of view

Szałowski

Balcerzak

Bobák

2011

Journal of Magnetism and Magnetic Materials

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The thermodynamics of a site-diluted ferromagnetic Heisenberg model for spin S = 1/2 with interaction anisotropy in spin space is investigated. The study is aimed at presenting the magnetocaloric properties of such a model, including the entropy and temperature changes in magnetization/demagnetization processes, generalized Grüneisen ratio as well as the quantities characterizing the efficiency of magnetic cooling cycles. The results are obtained using Pair Approximation (PA) method and extensively compared with the Molecular Field Approximation (MFA) calculations. The importance of interaction anisotropy and site-dilution is discussed. The inadequacy of the MFA approach (even on the qualitative level) is found for selected quantities, while PA provides the results which are consistent with the experimentally observed behaviour.

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“…It has been demonstrated that it can be successfully applied to different families of soft magnetic amorphous alloys 1,2 ͑for which it was initially developed͒ and subsequently extended to rare earth based crystalline materials. [3][4][5] The theoretical background for this universal curve construction lies on scaling laws. 6 More recently, it has been shown 7,8 that the same phenomenological procedure is suitable for scaling the adiabatic temperature change, ⌬T ad , of second order phase transition materials.…”

Section: Introductionmentioning

confidence: 99%

Field dependence of the adiabatic temperature change in second order phase transition materials: Application to Gd

Franco

Conde

Romero-Enrique

et al. 2009

Journal of Applied Physics

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Articles you may be interested inComparison of the order of magnetic phase transitions in several magnetocaloric materials using the rescaled universal curve, Banerjee and mean field theory criteria J. Appl. Phys. 117, 17D144 (2015) The field dependence of the adiabatic temperature change ⌬T ad of second order phase transition materials is studied, both theoretically and experimentally. Using scaling laws, it is demonstrated that, at the Curie temperature, the field dependence of ⌬T ad is characterized by H 1/⌬ . Therefore, as the magnetic entropy change ⌬S M follows a H ͑1−␣͒/⌬ power law, these two dependencies coincide only in the case of a mean field model. A phenomenological construction of a universal curve for ⌬T ad is presented, and its theoretical justification is also given. This universal curve can be used to predict the response of materials in different conditions not available in the laboratory ͑extrapolations in field or temperature͒, for enhancing the resolution of the data and as a simple screening procedure for the characterization of materials.

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The influence of a minority magnetic phase on the field dependence of the magnetocaloric effect

Cited by 107 publications

References 22 publications

Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

Universal behavior for magnetic entropy change in magnetocaloric materials: An analysis on the nature of phase transitions

Thermodynamic properties of a diluted Heisenberg ferromagnet with interaction anisotropy—Magnetocaloric point of view

Field dependence of the adiabatic temperature change in second order phase transition materials: Application to Gd

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