Critical behavior near the ferromagnetic-paramagnetic transformation in the austenite phase of Ni43Mn46Sn8X3 (X = In and Cr) Heusler alloys

Nan, Wen-Zhe; Thành, Trần Đăng; Nam, Gnu; You, Tae‐Soo; Piao, Hong‐Guang; Pan, Liqing; Yu, Seong‐Cho

doi:10.1016/j.jmmm.2017.07.034

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…Accordingly, the critical behaviour of the ribbons can be welldescribed by the mean field, MF, with a dominated long-range order of ferromagnetic interactions. Similar critical behaviour was reported for the Ni 43 Mn 46 Sn 8 In 3 Heusler alloy prepared by arc melting and annealing at 1323 K for 48 h. The small deviations in critical exponents β and γ from those expected for the mean field model were related to the coexistence of FM and AFM interactions in the alloy [38]. It is obvious that preparation conditions and, consequently, the alloy's microstructure influences their critical behavior considerably.…”

Section: Critical Behaviorsupporting

confidence: 75%

Microstructure, Critical Behavior and Magnetocaloric Properties of Melt-Spun Ni51.82Mn32.37In15.81

et al. 2022

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Heusler alloy with an atomic composition of Ni51.82Mn32.37In15.81 was prepared by melt spinning from arc-melted ingots. X−ray diffraction, scanning electron microscopy and magnetic measurements were used to study the structural, microstructural and magnetic properties. The crystal structure consists of a mixture of B2 austenite (~50%) and 14M martensite (~50%). The alloy undergoes a second order magnetic transition at a Curie temperature of TcA=194.2 K. The hysteresis loop reveals the occurrence of exchange bias phenomenon at room temperature. The critical exponents β, γ and δ were estimated using modified Arrott plots, Kouvel–Fisher curves and critical isothermal analysis. The respective values are β=0.500±0.015, γ=1.282±0.055 and δ=3.003±0.002. The critical behaviour in ribbons is governed by the mean field model with a dominated long-range order of ferromagnetic interactions. The maximum entropy change, ∆SMmax, for an applied magnetic field of 5 T reaches an absolute value of 0.92 J/kg.K. The experimental results of entropy changes are in good agreement with those calculated using Landau theory.

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Section: Critical Behaviorsupporting

confidence: 75%

Microstructure, Critical Behavior and Magnetocaloric Properties of Melt-Spun Ni51.82Mn32.37In15.81

et al. 2022

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“…For instance, Phan et al 8 showed that Sn substitution at Mn site in Ni 50 Mn 50-x Sn x affects the short-range FM interactions and lead to the formation of ordered FM phase in the system. Additionally, the role of various substitutions is studied through critical exponent analysis as reported in Ni 43 Mn 46 Sn 8 Z 3 (Z = Cr and In), Ni 47 Mn 40 Sn 13-x Cu x , Ni 2.2 Mn 0.72-x V x Ga 1.08 10 – 12 . Furthermore, disorder also influences the critical phenomenon around FM transition 9 , 18 – 20 .…”

Section: Introductionmentioning

confidence: 99%

Unconventional critical behaviour in weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1)

Yadav

Ranaut

Mukherjee

2021

Sci Rep

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Recent investigation on weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1) reveal the existence of a cluster glass phase (CGP) and a Griffiths-like phase (GP) below and above the ferromagnetic transition temperature (TC), respectively [(2019) Sci. Rep.9 15888]. In this work, the influence of these inhomogeneous phases on the critical behaviour (around TC) of the above-mentioned series of alloys has been investigated in detail. For the parent alloy Fe2CrAl, the critical exponent γ is estimated as ~ 1.34, which lies near to the ordered 3D Heisenberg class, whereas the obtained value of the critical exponent β ~ 0.273 does not belong to any universality class. With increment in Mn concentration, both exponents γ and β increase, where γ and β approach the disordered and ordered 3D Heisenberg class, respectively. The observed deviation of γ and unconventional value of δ can be ascribed to the increment of GP with Mn-concentration. The trend noted for β can be attributed to the increment in CGP regime with an increase in Mn-content. The estimated critical exponents are consistent and reliable as corroborated using the scaling law and equations of state. Our studies indicate that the critical phenomenon of Fe2-xMnxCrAl (0 ≤ x < 1) alloys possibly belong to a separate class, which is not described within the framework of any existing universal model.

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“…Moreover, the analysis of critical exponents for appropriate model proves very informative in examining the magnetic interactions and establishing a correlation between the critical exponents and exchange integral responsible for ferromagnetic transition. The critical exponents near the PM-FM transition in the austenite phase of Ni 43 Mn 46 Sn 8 X 3 (X = In and Cr) Heusler alloys have been analysed within the framework of long range mean-field theory [45]. The recent results show deviation of critical exponents from the long range meanfield model, which is explained with two different behaviors that belonging to two different universality classes [46,47].…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric properties and critical behavior of Co$_2$Cr$_{1-x}$Mn$_x$Al Heusler alloys

Nehla,

Anand,

Klemke

et al. 2019

Preprint

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We study the magnetocaloric effect and critical behavior of Co2Cr1−xMnxAl (x = 0.25, 0.5, 0.75) Heusler alloys across the ferromagnetic (FM) transition (TC). The Rietveld refinement of x-ray diffraction patterns exhibit single phase cubic structure for all the samples. The temperature dependent magnetic susceptibility χ(T) data show a systematic enhancement in the Curie temperature and effective magnetic moment with Mn concentration, which is consistent with the Slater-Pauling behavior. The M(H) isotherms also exhibit the FM ordering and the analysis of χ(T) data indicates the nature of the phase transition to be a second order, which is further supported by scaling of the entropy curves and Arrott plot. Interestingly, the Mn substitution causes an increase in the magnetic entropy change and hence large relative cooling power for multi-stage magnetic refrigerator applications. In order to understand the nature of the magnetic phase transition we examine the critical exponents β, γ, δ for the x = 0.75 sample by the modified Arrott plot and the critical isotherm analysis, which is further confirmed by Kouvel-Fisher method and Widom scaling relation, respectively. The estimated values of β = 0.507, γ = 1.056, δ = 3.084 are found to be close to the mean field theoretical values. The renormalized isotherms (m vs h) corresponding to these exponent values collapse into two branches, above and below TC that validates our analysis. Our results suggest for the existence of long-range FM interactions, which decays slower than power law as J(r) ∼ r −4.5 for a 3 dimensional mean field theory.

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Critical behavior near the ferromagnetic-paramagnetic transformation in the austenite phase of Ni43Mn46Sn8X3 (X = In and Cr) Heusler alloys

Cited by 7 publications

References 38 publications

Microstructure, Critical Behavior and Magnetocaloric Properties of Melt-Spun Ni51.82Mn32.37In15.81

Microstructure, Critical Behavior and Magnetocaloric Properties of Melt-Spun Ni51.82Mn32.37In15.81

Unconventional critical behaviour in weak ferromagnets Fe2-xMnxCrAl (0 ≤ x < 1)

Magnetocaloric properties and critical behavior of Co$_2$Cr$_{1-x}$Mn$_x$Al Heusler alloys

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