Influence of the demagnetizing field on the determination of the magnetocaloric effect from magnetization curves

Caballero-Flores, R.; Franco, V.; Conde, A.; Kiss, L. F.

doi:10.1063/1.3067463

Cited by 56 publications

(35 citation statements)

References 7 publications

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“…12͒ or the influence of the demagnetization factor. 33 In the present work, we have used two references instead of one in order to assure that if a breakdown of the universal behavior of ⌬S M should occur, it could not be ascribed to any of the previously mentioned artifactual causes.…”

Section: ͮ ͑2͒mentioning

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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Section: ͮ ͑2͒mentioning

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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“…We report upon the excellent magnetocaloric properties of Gd 53 Al 24 Co 20 Zr 3 amorphous microwires. In addition to obtaining the large magnetic entropy change (ÀDS M $ 10.3 J/kg K at T C $ 95 K), an extremely large value of refrigerant capacity (RC $ 733.4 J/kg) has been achieved for a field change of 5 T in an array of forty microwires arranged in parallel.…”

mentioning

confidence: 99%

Excellent magnetocaloric properties of melt-extracted Gd-based amorphous microwires

Bingham

Wang

Qin

et al. 2012

Applied Physics Letters

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We report upon the excellent magnetocaloric properties of Gd53Al24Co20Zr3 amorphous microwires. In addition to obtaining the large magnetic entropy change (−ΔSM ∼ 10.3 J/kg K at TC ∼ 95 K), an extremely large value of refrigerant capacity (RC ∼ 733.4 J/kg) has been achieved for a field change of 5 T in an array of forty microwires arranged in parallel. This value of RC is about 79% and 103% larger than those of Gd (∼410 J/kg) and Gd5Si2Ge1.9Fe0.1 (∼360 J/kg) regardless of their magnetic ordering temperatures. The design and fabrication of a magnetic bed made of these parallel-arranged microwires would thus be a very promising approach for active magnetic refrigeration for nitrogen liquefaction. Since these microwires can easily be assembled as laminate structures, they have potential applications as a cooling device for micro electro mechanical systems and nano electro mechanical systems.

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“…Although the universal curve can be built with only one reference temperature, 12 it has been shown that the effect of the demagnetization factor 18 or the presence of a minority magnetic phase 19 can lead to a breakdown of the ⌬S M curve collapse. Two reference temperatures are used in the data treatment in order to avoid the effect of these extrinsic factors.…”

Section: A New Criterion To Distinguish the Order Of Magnetic Transitmentioning

confidence: 99%

A new criterion to distinguish the order of magnetic transitions by means of magnetic measurements

Bonilla

Bartolomé

Garcı́a

et al. 2010

Journal of Applied Physics

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A universal curve for the magnetic entropy change has been found to exist for a variety of materials with second order phase transitions. We have studied whether this universal behavior of the magnetocaloric effect is maintained in materials with first order phase transition, including RCo2 Laves phases and mixed La2/3(CaxSr1−x)1/3MnO3 manganites, which present both second order and first order magnetic ordering phase transitions. The rescaled magnetic entropy change curves for different applied fields collapse onto a single curve only for materials with second order phase transition. This universal curve may be used as a criterion for determining the order of magnetic phase transitions from purely magnetic measurements.

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Influence of the demagnetizing field on the determination of the magnetocaloric effect from magnetization curves

Cited by 56 publications

References 7 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

Excellent magnetocaloric properties of melt-extracted Gd-based amorphous microwires

A new criterion to distinguish the order of magnetic transitions by means of magnetic measurements

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