Influence of structural defects on the magnetocaloric effect in the vicinity of the first order magnetic transition in Fe50.4Rh49.6

Zverev, V. I.; Saletsky, A. M.; Gimaev, Radel R.; Tishin, A.M.; Miyanaga, Takafumi; Staunton, J. B.

doi:10.1063/1.4949355

Cited by 49 publications

(37 citation statements)

References 35 publications

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“…Indeed, exceptions are possible. As a magnetocaloric model system with one of the highest adiabatic temperature changes, FeRh provides essential insight into the dynamics of the magnetostructural phase transition . In a narrow interval around the stoichiometric composition, FeRh forms an ordered B2 phase with a CsCl structure.…”

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

“…FeRh has one of the highest adiabatic temperature changes of all known materials, accompanied by a large entropy change observed at the transition . Due to the large volume change, it is also accompanied by large elasto‐ and barocaloric effects .…”

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

“…From the above considerations,t he question arises,w hether the parasitic competition between the lattice and magnetic entropy is an unavoidablef eature of inverse magnetocaloric materials.I ndeed, exceptions are possible.A sam agnetocaloric model system with one of the highesta diabatic temperaturec hanges,F eRhp rovides essential insight into the dynamics of the magnetostructural phase transition. [3,11,[94][95][96] In an arrow interval around the stoichiometric composition, FeRh forms an ordered B2 phase with aC sCl structure.T he particular interest in this system results also from its unusual temperature-driven isostructural transition between aF M above T t~3 50 Ka nd antiferromagnetic (AF) phase below. [97][98][99][100] This transition is accompanied by al arge decreasei nv olume of % 1% and the complete loss of the Rhmomenti nt he G-type AF phase,w hich amounts to sizeable 1.0 m B in the FM state.T he Fe moments, however, remain essentially constant across the transition with values of 3.2-3.3 m B .F or ar ecent review on this system see Ref.…”

Section: Ferhmentioning

confidence: 99%

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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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Magnetic refrigeration relies on a substantial entropy change in a magnetocaloric material when a magnetic field is applied. Such entropy changes are present at first‐order magnetostructural transitions around a specific temperature at which the applied magnetic field induces a magnetostructural phase transition and causes a conventional or inverse magnetocaloric effect (MCE). First‐order magnetostructural transitions show large effects, but involve transitional hysteresis, which is a loss source that hinders the reversibility of the adiabatic temperature change ΔTad. However, reversibility is required for the efficient operation of the heat pump. Thus, it is the mastering of that hysteresis that is the key challenge to advance magnetocaloric materials. We review the origin of the large MCE and of the hysteresis in the most promising first‐order magnetocaloric materials such as Ni–Mn‐based Heusler alloys, FeRh, La(FeSi)13‐based compounds, Mn3GaC antiperovskites, and Fe2P compounds. We discuss the microscopic contributions of the entropy change, the magnetic interactions, the effect of hysteresis on the reversible MCE, and the size‐ and time‐dependence of the MCE at magnetostructural transitions.

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Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

Section: Disentangling the Microscopic Contributions To The Entropy Cmentioning

confidence: 99%

Section: Ferhmentioning

confidence: 99%

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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

et al. 2018

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“…Direct magnetocaloric effect (MCE) measurements were performed using the MagEq MMS 801 (AMT&C LLC) system which has been described in [18][19][20]. Direct measurements were conducted in the same way as reported ones previously [20].…”

Section: Methodsmentioning

confidence: 99%

Peculiarities of the magnetocaloric effect in FeRh-based alloys in the vicinity of the first order magnetic phase transition

et al. 2018

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Medical applications of magnetocaloric effect (MCE) require possibility for precision shift of a temperature of the magnetic phase transition at the same MCE value and minimize irreversibility. Thus, detail dynamic MCE investigation of such alloys with non-toxic biocompatible dopants need to be done. In present work, the giant magnetocaloric effect, which is observed in the whole family of Fe-Rh alloys, has been investigated in Pd-doped samples in slowly cycled magnetic fields of up to 1.8 T in magnitude for a range of temperatures, 250 K < T < 350 K. The shift of the ferromagnetic/antiferromagnetic transition temperature down towards room temperature and the decrease in the MCE have been observed in these alloys in comparison with a quasi-equiatomic FeRh alloy. The measurements have also shown an asymmetric behaviour of the first order magnetic phase transition with respect to whether the transition is traversed by heating from lower temperatures or cooling from above. These peculiarities have been explained in the framework of the ab-initio density functional theory-based disordered local moment theory of the MCE. The results have been compared with the those for the non-doped FeRh alloy. Thus features of the first order magnetic phase transition that these alloys have in common have been revealed which enable some predictions to be made appropriate for practical applications.

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“…Коэффициенты Гинзбурга-Ландау a 1,2,3 считаются независимыми от температуры T, за исключением коэффициента a 1 , который в соответствии с теорией Ландау фазовых переходов предполагается линейно зависящим от температуры a 1 = a 0 (T − T 0 ), где температура T 0 есть температура фазового перехода. Для простоты изложения в (1) мы ограничились рассмотрением только двух параметров порядка -намагниченности M и поляризации P. Более точные результаты могут быть получены, если учесть векторный характер этих величин и ввести дополнительные параметры порядка, отвечающие различным подрешёткам магнитострикционного материала [21]. Условие экстремальности F приводит к уравнениям для определения M и P…”

Section: результаты и обсуждениеunclassified

Electric field controlled magnetic phase transition in Fe49Rh51 based magnetoelectric composites

Амиров¹,

Starkov²,

Starkov³

et al. 2018

LoM

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A three-layer magnetoelectric composite PZT / FeRh / PZT consisting of a layer of a magnetic alloy Fe 49 Rh 51 and two layers of a piezoelectric lead zirconate PbZr 0.53 Ti 0.47 O 3 was fabricated and its magnetic properties were studied. The magnetic alloy Fe 49 Rh 51 from which the magnetic layer was made was obtained by induction melting from pure rhodium Rh (99.9 %) and iron Fe (99.98 %). An X-ray diffraction analysis of the alloy showed the predominance of a B2 type phase with a bcc structure with an impurity phase of type α' with a fcc structure. Elemental analysis confirmed the composition corresponding to Fe 49 Rh 51. Temperature dependences of magnetic susceptibility were measured in two regimes: with piezoelectric layers under voltage ("switch on") and without voltage ("switch off "). In the "switch off " regime a phase transition at 324 K in heating and at 315 K in cooling is observed that is different from the results for pure Fe 49 Rh 51. Application of a voltage to the opposite faces of the composite induces a mechanical stress on the magnetic layer that leads to a decrease in the magnetic susceptibility and shift of the transition temperatures to 320 K in heating and 316 K in cooling. Moreover, this mechanical stress changes the shape and area of the hysteresis, which can be used for control of magnetic properties of materials. The magnetic properties and temperature hysteresis with applied electric field have been theoretically considered and explained on the basis of the Landau-Khalatnikov equations.

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Influence of structural defects on the magnetocaloric effect in the vicinity of the first order magnetic transition in Fe50.4Rh49.6

Cited by 49 publications

References 35 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Peculiarities of the magnetocaloric effect in FeRh-based alloys in the vicinity of the first order magnetic phase transition

Electric field controlled magnetic phase transition in Fe49Rh51 based magnetoelectric composites

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