On the correct estimation of the magnetic entropy change across the magneto-structural transition from the Maxwell relation: Study of MnCoGeBx alloy ribbons

Quintana-Nedelcos, A.; Llamazares, J.L. Sánchez; Sánchez-Valdés, C.F.; Álvarez-Alonso, Pablo; Gorría, P.; Shamba, P.; Morley, N. A.

doi:10.1016/j.jallcom.2016.10.116

Cited by 38 publications

(8 citation statements)

References 45 publications

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“…A set of isothermal magnetization M(oH) curves, was also measured across the AFM ↔ FM transition, from which the magnetic-field induced entropy change as a function of temperature, ΔSM(T), was determined by numerically integrating Maxwell relation. The following thermal cycle was followed to measure M(oH) at each fixed temperature [23]: (i) heating to 400 K in a zero magnetic field followed by cooling to 200 K;…”

Section: Methodsmentioning

confidence: 99%

The effect of cooling rate on magnetothermal properties of Fe49Rh51

Sánchez-Valdés

Gimaev

López-Cruz

et al. 2020

Journal of Magnetism and Magnetic Materials

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We have investigated the effects of quenching rate on the thermal dependence of the magnetic entropy change ΔSM(T) and the magnetic field induced hysteresis loss through the antiferromagnetic (AFM) ↔ ferromagnetic (FM) transformation in bulk Fe49Rh51. Two nearly identical square-prism-shaped samples were subjected to two different temperature cooling regimes; one was rapidly quenched (FQ) in icedwater and another slow cooled (SC) to room temperature at a cooling rate of 2 K/min. The temperature of the AFM ↔ FM transition is similar for both samples, but the FQ sample shows much sharper temperature-and magnetic field-induced magnetization change; in addition, the total magnetization change is 14% larger. In FQ material, the magnetocaloric effect, i.e., ΔSM(T) quickly approaches saturation above 1 T and shows a large peak value at 2 T (13.9 versus 8.9 Jkg−1 K−1 in SC material), but a larger average hysteresis loss <HL>FWHM in the temperature range coinciding with of the fullwidth at half-maximum of the ΔSM(T) curve.

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Section: Methodsmentioning
confidence: 99%

The effect of cooling rate on magnetothermal properties of Fe49Rh51
Sánchez-Valdés
¹
,
Gimaev
²
,
López-Cruz
³

et al. 2020
Journal of Magnetism and Magnetic Materials
Self Cite
33
1
10
0
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“…This thermal cycling ensures that, prior to apply the magnetic field at a given T meas , the sample assumes the phase constitution that corresponds to the thermally induced structural transition. 23 The presence of thermal hysteresis and the jump-like change in magnetization at the martensitic transition results from the first order nature of the transition. A shift in the martensitic transition by 70 K to higher temperature from T = 240 K (bulk value) to T = 315 K was observed.…”

Section: Resultsmentioning
confidence: 99%

Magnetostructural transitions and magnetocaloric effects in Ni50Mn35In14.25B0.75 ribbons
Pandey
¹
,
Quetz
²
,
Ibarra-Gaytán
³

et al. 2018
AIP Advances
8
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1
0
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The structural, thermal, and magnetic behaviors, as well as the martensitic phase transformation and related magnetocaloric response of Ni50Mn35In14.25B0.75 annealed ribbons have been investigated using room-temperature X-ray diffraction (XRD), differential scanning calorimetry (DSC), and magnetization measurements. Ni50Mn35In14.25B0.75 annealed ribbons show a sharper change in magnetization at the martensitic transition, resulting in larger magnetic entropy changes in comparison to bulk Ni50Mn35In14.25B0.75. A drastic shift in the martensitic transformation temperature (TM) of 70 K to higher temperature was observed for the annealed ribbons relative to that of the bulk (TM = 240 K). The results obtained for magnetic, thermal, structural, and magnetocaloric properties of annealed ribbons have been compared to those of the corresponding bulk alloys.

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“…Consequently, both the ferromagnetic and paramagnetic states coexist and the material shows an anomalous M -H curve at an adjacent temperature, giving rise to incorrect ∆S M . Detailed discussion on this problem is given in the literature [17][18][19]. In the present study, the M -T curves measured at various fields are used to estimate ∆S M .…”

Section: Methodsmentioning
confidence: 99%

Magnetocaloric Properties of (MnFeRu)2(PSi) as Magnetic Refrigerants near Room Temperature
Ohnishi¹,
Soejima²,
Yamashita³
et al. 2017
Magnetochemistry
11
0
2
0
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Abstract:We have scaled up the production process of magnetic refrigerants near room temperature. The Mn 2−y Fe y−x Ru x P 1−z Si z compounds with 0.03 ≤ x ≤ 0.16, y ≈ 0.75, and z ≈ 0.55 were synthesized and their magnetocaloric properties were examined. By changing the compositions and the annealing temperature, the Curie temperature was tuned between 275 and 315 K with 2~3 K steps. All the compounds underwent a first-order magnetic transition accompanied by thermal hysteresis of less than 2 K. The compounds showed excellent magnetocaloric properties: the magnetic entropy change was more than 10 J/K·kg and the refrigerant capacity was about 115 J/kg in a field change of 1.5 T. The detailed instructions to synthesize high-performance (MnFe) 2 PSi materials are given.

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On the correct estimation of the magnetic entropy change across the magneto-structural transition from the Maxwell relation: Study of MnCoGeBx alloy ribbons

Cited by 38 publications

References 45 publications

The effect of cooling rate on magnetothermal properties of Fe49Rh51

The effect of cooling rate on magnetothermal properties of Fe49Rh51

Magnetostructural transitions and magnetocaloric effects in Ni50Mn35In14.25B0.75 ribbons

Magnetocaloric Properties of (MnFeRu)2(PSi) as Magnetic Refrigerants near Room Temperature

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