Magnetocaloric properties of Ni2Mn1−xCuxGa

Stadler, Shane; Khan, Mahmud; Mitchell, J.; Ali, Naushad; Gomes, A. M.; Dubenko, Igor; Takeuchi, A.Y.; Guimarães, A.P.

doi:10.1063/1.2202751

Cited by 241 publications

(152 citation statements)

References 26 publications

(34 reference statements)

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“…Another advantage of this alloy is that due to small hysteresis in the M (H) curve at T = 90 K, the energy loss is minimum (∼ 8 J/kg) compared to other Mn-based systems [39][40][41].…”

Section: Methodsmentioning

confidence: 99%

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

Bag

Nath

2018

Solid State Communications

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-The first order magneto-structural transition (Tt ≃ 95 K) and magnetocaloric effect in MnNiGe0.9Ga0.1 are studied via powder x-ray diffraction and magnetization measurements. Temperature dependent x-ray diffraction measurements reveal that the magneto-structural transition remains incomplete down to 23 K, resulting in a coexistence of antiferromagnetic and ferromagnetic phases at low temperatures. The fraction of the high temperature Ni2In-type hexagonal ferromagnetic and low temperature TiNiSi-type orthorhombic antiferromagnetic phases is estimated to be ∼ 40% and ∼ 60%, respectively at 23 K. The ferromagnetic phase fraction increases with increasing field which is found to be in non-equilibrium state and gives rise to a weak re-entrant transition while warming under field-cooled condition. It shows a large inverse magnetocaloric effect across the magneto-structural transition and a conventional magnetocaloric effect across the second order paramagnetic to ferromagnetic transition. The relative cooling power which characterises the performance of a magnetic refrigerant material is found to be reasonably high compared to the other reported magnetocaloric alloys.Introduction. -Heusler alloys with magnetostructural transition (MST) are receiving increasing attention in current condensed matter physics due to their fundamental and technological relevance. In such materials, manifestation of MST often gives rise to interesting properties such as magnetocaloric effect (MCE) [1,2],magnetoresistance [3,4], field induced shape memory/strain effect [5,6], glass like magnetic states [7,8] etc. In particular, magnetic refrigeration based on the MCE has been thought as a possible alternative for the vapour compression refrigeration technique, though it is far from being possible. Therefore, technological advances demand new and improved materials with MST at elevated temperatures.

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“…Another advantage of this alloy is that due to small hysteresis in the M (H) curve at T = 90 K, the energy loss is minimum (∼ 8 J/kg) compared to other Mn-based systems [39][40][41].…”

Section: Methodsmentioning

confidence: 99%

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

Bag

Nath

2018

Solid State Communications

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“…This phenomenon is corresponding with values of magnetic entropy change. is not capable of measuring the ∆T above RT but one could expect a peak value ≈1.5 2 K [7]. At RT Ni 50 Mn 18.75 Cu 6.25 Ga 25 alloy shows very low value of |∆S M | ≈ 0.7 J/(kg K) which provide temperature change of ≈0.4 K (Fig.…”

Section: The Transformation Temperaturesmentioning

confidence: 99%

“…2) gives the Curie point the nature of rst-order transition (rapid loss of magnetization) [7]. The Gd addition in Ni 50 Mn 16.75 Cu 6.25 Ga 25 Gd 2 alloy leads to separating both transition temperatures (Fig.…”

Section: The Transformation Temperaturesmentioning

confidence: 99%

“…Both temperatures T M and T C , can be adjusted by tailoring the chemical composition. Replacing Mn with Cu in Ni 2 Mn 1−x Cu x Ga, leads to coincidence of the two transition temperatures (T M = T C = T MC ), for x = 0.25 [7]. The magnetic entropy changes (∆S M ) were calculated, as in [8], using the experimental M (T ) curves and integrated Maxwell relation…”

Section: Introductionmentioning

confidence: 99%

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Magnetocaloric Effect in Ni-Cu-Mn-Gd-Ga Alloy. XI Symposium of Magnetic Measurements

2015

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The magnetocaloric e ect of the Ni Cu Mn Gd Ga polycrystalline alloy was investigated. The nominal composition of the alloy was Ni50Cu6.25Mn16.75Ga25Gd2 at.%. The X-ray di raction studies revealed presence of two phases at room temperature. This was con rmed by magnetic measurements conducted in low eld of 4 kA/m (50 Oe), which showed two Curie transition temperatures, one in vicinity and the other one well above the room temperature. The analysis of isothermal magnetic curves allowed the calculation of magnetic entropy change (∆SM ). Although the peak value of |∆SM | is relatively low, ≈1.1 J/(kg K), it is very broad. The adiabatic temperature change (∆T ) measured near room temperature is ≈0.49 K. Such result is irrespective of the magnetizingdemagnetizing cycle frequency which varied from 2/min to 10/min.

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“…It has been observed that both T M and T C values are very much dependent on the composition of a particular Heusler alloy. [4][5][6][7][8][9][10][11][12][13][14][15][16] There is also another category of full Heusler alloys, which are known to be metallic for one kind of spin channel and insulator for the other kind of spin channel because of their very high spin polarization (HSP) at the Fermi level. They are often called as half metallic Heusler alloys.…”

Section: Introductionmentioning

confidence: 99%

Ab initio study of effect of Co substitution on the magnetic properties of Ni and Pt-based Heusler alloys

Roy

Chakrabarti

2017

Physics Letters A

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Using density functional theory based calculations, we have carried out in-depth studies of effect of Co substitution on the magnetic properties of Ni and Pt-based shape memory alloys. We show the systematic variation of the total magnetic moment, as a function of Co doping. A detailed analysis of evolution of Heisenberg exchange coupling parameters as a function of Co doping has been presented here. The strength of RKKY type of exchange interaction is found to decay with the increase of Co doping.

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Magnetocaloric properties of Ni2Mn1−xCuxGa

Cited by 241 publications

References 26 publications

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

First order magneto-structural transition and magnetocaloric effect in MnNiGe0.9Ga0.1

Magnetocaloric Effect in Ni-Cu-Mn-Gd-Ga Alloy. XI Symposium of Magnetic Measurements

Ab initio study of effect of Co substitution on the magnetic properties of Ni and Pt-based Heusler alloys

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