Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations

Sokolovskiy, V. V.; Buchelnikov, V. D.; Skokov, Konstantin P.; Gutfleisch, Oliver; Karpenkov, D.; Koshkid’ko, Yu. S.; Miki, Hiroyuki; Dubenko, Igor; Ali, Naushad; Stadler, Shane; Khovaylo, Vladimir

doi:10.1063/1.4826366

Cited by 32 publications

(16 citation statements)

References 48 publications

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“…(a-d) FMR spectraofp owder Ni45 Mn 37 In 13 Co 5 in the high-temperature austenitephase at 430 K(a) and 305 K(b) and in the low-temperature martensite phase at 150 K(c) and 5.2 K(d) taken in external field sweeps from 1.6 Tto0T. The (red)dotted line in each spectrum represents the isotropic valuea nd the signala thigherfields (red circle) is magnified by a factor of 100 for visualization.Figure adaptedfrom Ref.…”

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confidence: 99%

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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Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

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“…This is quite different from the conditions where Fe, Co, Cu, Ti, B, and rare earth elements are doped. [7][8][9][10][11][12][13][14][15][16][17][18][19] As mentioned in the Introduction section, there are mainly two factors influencing the martensitic transformation temperatures, i.e., e/a and size effect. 2,5 Here, both In and Ga atoms possess the same number of valence electron.…”

Section: Resultsmentioning

confidence: 99%

“…In previous reports, Fe, Co, Cu, Ti, B, and rare earth elements have been doped into Ni-Mn-Ga alloys. [7][8][9][10][11][12][13][14][15][16][17][18] In case of the substitution of Fe, Co, or Cu for Ni, the martensitic transformation temperatures are significantly decreased. The Curie temperature and the saturation magnetization are increased by Fe and Co, 7-12 and decreased by Cu.…”

Section: Introductionmentioning

confidence: 99%

“…The Curie temperature and the saturation magnetization are increased by Fe and Co, 7-12 and decreased by Cu. 13,14 By the substitution of Cu or Co for Mn, the martensitic transformation is shifted to higher temperatures and the magnetic transition temperature is lowered. 15,16 By doping Ti, B, and rare earth elements, the martensitic transformation temperatures are generally increased, but the Curie temperature and the saturation magnetization are obviously decreased.…”

Section: Introductionmentioning

confidence: 99%

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Effect of isoelectronic substitution on phase transition and magnetic properties of Ni57Mn18Ga25−xInx (0 ≤ x ≤ 8) alloys with Ni excess

Liu

Wang

Zhang

et al. 2015

Journal of Applied Physics

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Effect of isoelectronic substitution of In for Ga on the phase transition and magnetic properties was studied in Ni 57 Mn 18 Ga 25Àx In x (0 x 8) alloys. With the increasing In content, the roomtemperature phase structure evolved from tetragonal martensite to cubic austenite. The martensitic transformation temperatures were significantly decreased by the substitution of In for Ga, but the austenitic Curie temperature was only slightly decreased. Especially, both thermal and isothermal magnetization measurements revealed that the Curie temperature and saturation magnetization of the martensite were independent on the isoelectronic substitution. The results were discussed by considering the phase structures and the atomic interactions. V C 2015 AIP Publishing LLC.

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“…We would like to note that the more detailed information have already been published (for example see Refs. ), but for the sake of completeness and discussion, let us briefly explain the basic idea behind our approach.…”

Section: Computational Schemementioning

confidence: 99%

Monte Carlo Simulations of Thermal Hysteresis in Ni‐Mn‐Based Heusler Alloys

Sokolovskiy

Загребин

Entel

2017

Physica Status Solidi (b)

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We present a study of the thermal hysteresis that takes place across the magnetostructural phase transition of the Ni-Mn-based Heusler alloys. The results have been obtained by means of first-principles calculations and Monte Carlo simulations based on the proposed Potts-Blume-Emery-Griffiths Hamiltonian involving magnetic and elastic degrees of freedom. First, separating the structural and magnetic contributions, we calculate the phase diagram including the martensitic transformation as a function of ratio between exchange structural constants in martensite and austenite (K/J). It is shown that the width of the thermal hysteresis depends on K/J and it is found to increase at a ratio of K/J between 0.20 and 0.37. A similar trend is also observed for the Landau free energy expansion. The evolutions of the magnetization and deformation order parameter of alloys studied under various applied magnetic fields are simulated as functions of temperature upon heating and cooling cycles. Furthermore, under high applied fields the nonlinear shift of dT m =dH ext and change of hysteresis width according to the relation between magnetostructural interaction constants (U 1 and U 2 ) are observed. The results obtained with the Monte Carlo routine are discussed and demonstrated a good agreement with experimental data.

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Magnetocaloric and magnetic properties of Ni2Mn1−xCuxGa Heusler alloys: An insight from the direct measurements and ab initio and Monte Carlo calculations

Cited by 32 publications

References 48 publications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Hysteresis Design of Magnetocaloric Materials—From Basic Mechanisms to Applications

Effect of isoelectronic substitution on phase transition and magnetic properties of Ni57Mn18Ga25−xInx (0 ≤ x ≤ 8) alloys with Ni excess

Monte Carlo Simulations of Thermal Hysteresis in Ni‐Mn‐Based Heusler Alloys

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