Critical behavior and magnetocaloric effect in Co50−Ni Cr25Al25 (x= 0 and 5) full Heusler alloy system

Panda, J.; Saha, Shriya; Nath, T. K.

doi:10.1016/j.jallcom.2015.05.074

Cited by 24 publications

(21 citation statements)

References 50 publications

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“…8 observed. Such behavior is recognized as thermomagnetic irreversibility, and has previously been reported in various compounds [67][68][69]. It was reported that such behavior might be due to (i) the complex nature of the phase transition around and above the Tc, or (ii) due to non-collinear nature of the magnetic structure arising due to crystal filed effects, that could occur in highly anisotropic magnetic compounds, or (iii) due to domain wall pinning [70].…”

Section: Magnetic Propertiesmentioning

confidence: 89%

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

Ahmad

Srivastava

Das

2021

Journal of Alloys and Compounds

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Section: Magnetic Propertiesmentioning

confidence: 89%

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

Ahmad

Srivastava

Das

2021

Journal of Alloys and Compounds

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“…ΔC H is an important parameter to characterize the magnetic refrigeration power of the sample. ΔC H is related to magnetization or magnetic entropy with the change in field ΔH i and can be calculated by Equation (5).…”

Section: Isothermal Magnetizationmentioning

confidence: 99%

“…[4] Also, the ordering in some alloys is attributed to the double exchange model. [5,6] On the other hand, the interaction between further spins is mediated by Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, giving rise to long-range ferromagnetic ordering. [7] In cobalt (Co)-based Heusler alloys, the magnetocrystalline anisotropic exchange interaction may be involved in magnetic ordering due to strong spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%

“…The literature survey reveals that Co-based alloys exhibit the second-order paramagnetic to ferromagnetic phase transition, and they are free from thermal and magnetic hysteresis loss. [5,23,24] Also, the broad operating temperature of these alloys gives an advantage in cooling applications. MCE is another approach to study critical behavior due to the intrinsic relation between MCE and universality class.…”

Section: Introductionmentioning

confidence: 99%

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Correlation between Critical Behavior and Magnetocaloric Effect near Paramagnetic to Ferromagnetic Phase Transition of Co₂TiAl_0.75Si_0.25 Heusler Alloy

Datta

Guha

Panda

et al. 2020

Physica Status Solidi (b)

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Heusler alloys have drawn considerable interest, due to their tunable properties, for technological applications. The literature review reveals that the critical exponents and magnetocaloric effect (MCE) of Co2TiAl0.75Si0.25 quaternary Heusler alloy need to be established. Hence, Co2TiAl0.75Si0.25 alloy is prepared by the arc melting method. Critical exponents of the alloy are obtained by analyzing magnetic isotherms with various techniques, such as Arrot plots, Kouvel–Fisher plots, critical isotherm analysis, and magnetocaloric analysis near the transition temperature. The paramagnetic to ferromagnetic transition temperature is found to be ≈235 ±2.5 K. The nature of the Arrot plots and the universal curve of the MCE confirm this as a second‐order phase transition. Despite the moderate magnetocaloric values, the large working temperature (≈75 K at 3 T) makes this alloy a potential candidate for a multistage magnetic refrigeration application. The critical exponents obtained from different techniques fall in between the theoretical prediction from the mean field theory, which indicates long‐range ferromagnetic exchange interaction, and the 3D Heisenberg model, implying short‐range interaction. The range of interaction (σ = 1.727) also confirms this. This complex magnetic interaction may arise from the competition between localized and itinerant electron present in the system.

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“…In recent years, the magnetocaloric properties have been explored in Co-based Heusler alloys. These alloys show a second order phase transition (SOPT), and have advantages of broad operating temperature range [39] and absence of thermal and/or magnetic hysteresis [40,41]. In order to better understand the magnetic transition in these alloys, the study of critical phenomena in the vicinity of the phase transition will have a great significance.…”

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 and magnetocaloric effect in Co50−Ni Cr25Al25 (x= 0 and 5) full Heusler alloy system

Cited by 24 publications

References 50 publications

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

Correlation between Critical Behavior and Magnetocaloric Effect near Paramagnetic to Ferromagnetic Phase Transition of Co₂TiAl_0.75Si_0.25 Heusler Alloy

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

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Critical behavior and magnetocaloric effect in Co50−Ni Cr25Al25 (x= 0 and 5) full Heusler alloy system

Cited by 24 publications

References 50 publications

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

First-principles calculations and experimental studies on Co2FeGe Heusler alloy nanoparticles for spintronics applications

Correlation between Critical Behavior and Magnetocaloric Effect near Paramagnetic to Ferromagnetic Phase Transition of Co2TiAl0.75Si0.25 Heusler Alloy

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

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Correlation between Critical Behavior and Magnetocaloric Effect near Paramagnetic to Ferromagnetic Phase Transition of Co₂TiAl_0.75Si_0.25 Heusler Alloy