Magnetocaloric effect at the first-order magnetic phase transitions

Spichkin, Y.I.; Tishin, A.M.

doi:10.1016/j.jallcom.2005.05.026

Cited by 21 publications

(9 citation statements)

References 24 publications

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“…In the past 20 years, the research has been focused on the search of classes of materials with large entropy and temperature changes. While most magnetic materials show second order transitions in which the MCE properties reach their maximum values at the Curie point, the most promising classes were found among the magnetic materials displaying first order transitions in which the order parameter, that is the magnetization, changes discontinuously . The discontinuous change proper of first order transitions yields also a large entropy change that can be achieved also by applying a magnetic field.…”

Section: Magnetocaloric Materialsmentioning

confidence: 99%

Hysteresis and Phase Transition Kinetics in Magnetocaloric Materials

Basso

Piazzi

Bennati

2017

Physica Status Solidi (b)

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In the present paper, we review the recent research on the physics of magnetocaloric materials aiming to define a coherent theoretical framework in which hysteresis and kinetic effects can be appropriately discussed and interpreted in relation to intrinsic and extrinsic factors. We dedicate our efforts to introduce a thermodynamic description of the material, including the out-of-equilibrium aspects which are necessary to understand hysteresis, heat flux avalanches and thermal relaxation effects. In particular we show how intrinsic and extrinsic factors, contributing to define the energy landscape of the system, influence the resulting hysteresis and how different kinetic effects are expected depending on the phase transformation mechanisms, here described either as an out-of-equilibrium domain boundary motion or as a thermally activated process associated to energy barriers. Several applications of the theoretical models are discussed in relation with experiments on La(Fe-Si) 13 -based compounds and Mn-Bi.

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Section: Magnetocaloric Materialsmentioning

confidence: 99%

Hysteresis and Phase Transition Kinetics in Magnetocaloric Materials

Basso

Piazzi

Bennati

2017

Physica Status Solidi (b)

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“…A number of magnetic materials with large values of DS M /DT ad accompanied by a first order phase transition have been reported. [9][10][11][12][13][14][15] Nevertheless, only some of them, especially rare-earth-based intermetallic compounds, [16][17][18][19][20][21] have a small hysteresis loss, which is desirable for practical application. In addition, large reversible MCEs only appear in a small temperature range for most of the rare-earth-based intermetallic compounds.…”

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confidence: 99%

Large entropy change accompanying two successive magnetic phase transitions in TbMn2Si2 for magnetic refrigeration

Wang

Cheng

et al. 2015

Applied Physics Letters

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Structural and magnetic properties in TbMn2Si2 are studied by variable temperature X-ray diffraction, magnetization, electrical resistivity, and heat capacity measurements. TbMn2Si2 undergoes two successive magnetic transitions at around Tc1 = 50 K and Tc2 = 64 K. Tc1 remains almost constant with increasing magnetic field, but Tc2 shifts significantly to higher temperature. Thus, there are two partially overlapping peaks in the temperature dependence of magnetic entropy change, i.e., −ΔSM (T). The different responses of Tc1 and Tc2 to external magnetic field, and the overlapping of −ΔSM (T) around Tc1 and Tc2 induce a large refrigerant capacity (RC) within a large temperature range. The large reversible magnetocaloric effect (−ΔSMpeak ∼ 16 J/kg K for a field change of 0–5 T) and RC (=396 J/kg) indicate that TbMn2Si2 could be a promising candidate for low temperature magnetic refrigeration.

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“…The following section shows an attempt to do theoretical modeling of M S based on the mean-eld analysis of ÀDS M . 27 A general result issued from the mean-eld theory reveals the dependence of ÀDS M on the relative M is described as: 28,29…”

Section: Resultsmentioning

confidence: 99%