Giant reversible inverse magnetocaloric effects in Ni50Mn35In15 Heusler alloys

Quetz, Abdiel; Koshkid’ko, Yu. S.; Titov, Ivan; Rodionov, I. D.; Pandey, Sudip; Aryal, Anil; Ibarra-Gaytán, P. J.; Прудников, В. В.; Granovsky, A. B.; Dubenko, Igor; Samanta, Tapas; Ćwik, J.; Llamazares, J. L. Sánchez; Stadler, Shane; Lähderanta, E.; Ali, Naushad

doi:10.1016/j.jallcom.2016.05.106

Cited by 37 publications

(18 citation statements)

References 19 publications

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“…Clearly, the metamagnetic transition is driven by the Zeeman energy E zeeman = μ 0 HΔM , where ΔM and μ 0 H represent the magnetization difference between martensite/austenite phases and the applied magnetic field, respectively. So, enhanced ΔM is in favor of large E zeeman , which is responsible for the high magnetic entropy change ( ΔS M ) and wide working temperature span ( ΔT FWHM , defined as the full width at half maximum of the magnetic entropy peak) 8 , where the ΔT FWHM is crucial for magnetic refrigeration applications in the case of inverse MCE 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Zhang

Qian

et al. 2018

Sci Rep

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High magnetocaloric refrigeration performance requires large magnetic entropy change ΔSM and broad working temperature span ΔTFWHM. A fourth element doping of Co in ternary Ni-Mn-Sn alloy may significantly enhance the saturation magnetization of the alloy and thus enhance the ΔSM. Here, the effects of Co-doping on the martensite transformation, magnetic properties and magnetocaloric effects (MCE) of quaternary Ni47−xMn43Sn10Cox (x = 0, 6, 11) alloys were investigated. The martensite transformation temperatures decrease while austenite Curie point increases with Co content increasing to x = 6 and 11, thus broadening the temperature window for a high magnetization austenite (13.5, 91.7 and 109.1 A·m2/kg for x = 0, 6 and 11, respectively). Two successive magnetostructural transformations (A → 10 M and A → 10 M + 6 M) occur in the alloy x = 6, which are responsible for the giant magnetic entropy change ΔSM = 29.5 J/kg·K, wide working temperature span ΔTFWHM = 14 K and large effective refrigeration capacity RCeff = 232 J/kg under a magnetic field of 5.0 T. These results suggest that Ni40.6Mn43.3Sn10.0Co6.1 alloy may act as a potential solid-state magnetic refrigerant working at room temperature.

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Section: Introductionmentioning

confidence: 99%

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Zhang

Qian

et al. 2018

Sci Rep

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“…The possibility of the change of sign of ∆S 1→2 (T) function shown in Figures 2 and 4a is an unforeseen prediction of the theory, which points to possibility of both conventional and inverse MCE in different temperature ranges, while the M(T) function is monotone in this temperature range. (The observation of "neighboring" conventional and inverse magnetocaloric effects in metamagnetic SMAs is caused by the nonmonotonic change of M(T) below the Curie temperature [17][18][19].) This result follows from two features of Ni 50 Mn 17.5 Ga 25 Cu 7.5 alloy: first, the noticeable field-induced shift of MT temperature (~5 K), and second, abrupt change of large magnetization value M(T, H 1 ) during MT.…”

Section: Mce In Ni50mn175ga25cu75 Alloymentioning

confidence: 98%

“…One of the obstacles to the observation of inverse MCE may be related to the narrow (~2-5 K) temperature interval of negative entropy change (see Figure 2). However, this difficulty is surmountable: conventional and inverse MCE were observed in Ni 50 Mn 35 In 15 in the narrow temperature interval~10K [17][18][19].…”

Section: Mce In Ni50mn175ga25cu75 Alloymentioning

confidence: 99%

Magnetocaloric Effect Caused by Paramagnetic Austenite–Ferromagnetic Martensite Phase Transformation

Kosogor

L’vov

Lázpita

et al. 2018

Metals

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In the present work, the magnetization of Ni 50 Mn 17.5 Ga 25 Cu 7.5 alloy undergoing the first-order phase transition from paramagnetic austenite to ferromagnetic martensite was measured to evaluate the magnetic-field-induced entropy change (MFIEC) and refrigerant capacity (RC) of the alloy. A standard method (SM) of evaluation of MFIEC is based on thermodynamic Maxwell relation. In view of the criticism of SM expressed by some scientists, the alternative method (AM), which is based on thermodynamic relationships for free energy, was proposed recently for the determination of MFIEC. We developed this method and computed MFIEC in two ways-by AM and SM. The values of MFIEC obtained for Ni 50 Mn 17.5 Ga 25 Cu 7.5 alloy by these methods appeared to be large but very different from each other. Moreover, AM reveals the possibility of both normal and inverse magnetocaloric effects in the adjoining temperature ranges, while SM results only in the normal magnetocaloric effect.Keywords: inverse magnetocaloric effect; magnetic free energy; magnetic entropy change; strong magnetic filed; metamagnetic shape memory alloy should be expected in the temperature range corresponding to the abrupt change of magnetization value. This feature of magnetization behavior has attracted the attention of researchers to martensitic transformations (MTs) from ferromagnetic austenite to paramagnetic martensite, observed in the metamagnetic SMAs [1,2]. However, the abrupt change in magnetization also appears in the temperature range of first-order phase transformation of SMA, from paramagnetic austenite to ferromagnetic martensite [4][5][6]. Therefore, a theoretical estimation of the magnetic-field-induced entropy change for SMA undergoing such phase transformation may be a guide for experiments aimed at the improvement of magnetic refrigeration technology. However, sound arguments against the applicability of thermodynamic Maxwell relations to ferromagnetic solids undergoing first-order phase transitions were presented (see Refs. [1,7,8] and references therein). It was argued, firstly, that these relations were obtained for the equilibrium thermodynamic phase, and therefore, that they are not applicable to the mixed two-phase thermodynamic state arising in the temperature range of first-order phase transitions. It was found, secondly, that the MCE value strongly depends on the shift of phase transition temperature under magnetic field [9]. This feature of MCE obviously cannot follow from the equation obtained for the equilibrium thermodynamic phase. In this connection, other ways of evaluating MCE deserve careful attention.In the present study, we analyze the possibility of evaluating MCE from the fundamental thermodynamic relationshipwhich relates entropy function S to the temperature derivative of Helmholtz free energy F. The expression for free energy is a starting point of the Landau-type theories of magnetic, structural, and magnetostructural phase transitions. Due to this, Equation (2) was used recently for the evaluation of the magneti...

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“…Typically, Heusler alloys are studied in bulk form by SQUID magnetometry [4], optical magnetic methods [5], calorimetry [5], volumetry [6] and standard structural approaches such as XRD [7]. However, neither of the abovementioned methods can reveal micro-and nanoscale details of a mechanism of magnetostructural transition.…”

Section: Introductionmentioning

confidence: 99%

Visualization of magnetostructural transition in Heusler alloys by Magnetic Force Microscopy

et al. 2018

Self Cite

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Magnetostructural transition was observed in Ni-Mn-In-Cr Heusler alloy with help of Magnetic Force Microscopy (MFM). The crystal structure of a sample and characteristic temperatures of the phase transition were controlled by roentgenostructural phase analysis and magnetometry, respectively. It appeared prominently important to prepare the surface of the sample until the nanometer level of surface roughness. Magnetic study performed with scanning probe microscope revealed existence of magnetic domains, which were spread across the surface evenly. Further studies revealed that intensity of magnetic signal decreases as fading out of the contrast of the MFM images. It was found that location of domains shifted after the heating/cooling cycle above Curie temperature for the studied alloy. Location of new domain walls appeared correlating with surface scrapings and defects, whilst it became independent from those after heating until just 70°C. The mechanism behind the observed transition is proposed.

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Giant reversible inverse magnetocaloric effects in Ni50Mn35In15 Heusler alloys

Cited by 37 publications

References 19 publications

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Enhanced magnetocaloric effect in Ni-Mn-Sn-Co alloys with two successive magnetostructural transformations

Magnetocaloric Effect Caused by Paramagnetic Austenite–Ferromagnetic Martensite Phase Transformation

Visualization of magnetostructural transition in Heusler alloys by Magnetic Force Microscopy

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