Role of magnetic and atomic ordering in the martensitic transformation of Ni-Mn-In from a first-principles study

Li, Chunmei; Luo, Hubin; Hu, Qing‐Miao; Yang, Rui; Johansson, Börje; Vitos, Levente

doi:10.1103/physrevb.86.214205

Cited by 54 publications

(33 citation statements)

References 46 publications

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“…The linearity of these curves in M and T demonstrates the paramagnetism of the austenite phase. These results with a local magnetic moment of 4µ B agree with reported studies [17][18][19][20] and are consistent with magnetic moments in the sample attributed to manganese with at most a very small moment on other atoms. Note that the Curie temperature apparent here is very similar to T c ≈ 293 K observed in Ni 50 Mn 34 In 16 2 .…”

Section: B Magnetic Measurementssupporting

confidence: 92%

Calorimetric and magnetic study for Ni50Mn36In14 and relative cooling power in paramagnetic inverse magnetocaloric systems

Chen

Bruno

Караман

et al. 2014

Journal of Applied Physics

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The non-stoichiometric Heusler alloy Ni 50 Mn 36 In 14 undergoes a martensitic phase transformation in the vicinity of 345 K, with the high temperature austenite phase exhibiting paramagnetic rather than ferromagnetic behavior, as shown in similar alloys with lower-temperature transformations. Suitably prepared samples are shown to exhibit a sharp transformation, a relatively small thermal hysteresis, and a large field-induced entropy change. We analyzed the magnetocaloric behavior both through magnetization and direct fielddependent calorimetry measurements. For measurements passing through the first-order transformation, an improved method for heat-pulse relaxation calorimetry was designed. The results provide a firm basis for the analytic evaluation of field-induced entropy changes in related materials. An analysis of the relative cooling power (RCP), based on the integrated field-induced entropy change and magnetizing behavior of the Mn spin system with ferromagnetic correlations, shows that a significant RCP may be obtained in these materials by tuning the magnetic and structural transformation temperatures through minor compositional changes or local order changes.

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Section: B Magnetic Measurementssupporting

confidence: 92%

Calorimetric and magnetic study for Ni50Mn36In14 and relative cooling power in paramagnetic inverse magnetocaloric systems

Chen

Bruno

Караман

et al. 2014

Journal of Applied Physics

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“…For the four compositions, the results yield J very close to 2 as displayed in Table 1. The consistency of these results with a local magnetic moment of gJµ B = 4µ B per Mn ion also agrees with computed results [17,[30][31][32]]. It appears that in all cases the magnetism corresponds to local moments which are indirectly coupled through RKKY interactions [33].…”

Section: Magnetization Analysissupporting

confidence: 83%

“…There has been considerable interest in understanding the local nature of the magnetic moments in these materials, and it is interesting that ab initio calculations typically indicate a small nonzero moment on Ni [17,[30][31][32]44]. On the other hand, the magnetic and low-temperature calorimetric results can be understood consistently in terms of a J = 2 moment associated with each Mn.…”

Section: Discussionmentioning

confidence: 99%

Direct measure of giant magnetocaloric entropy contributions in Ni–Mn–In

et al. 2016

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Off-stoichiometric alloys based on Ni 2 MnIn have drawn attention due to the coupled first order magnetic and structural transformations, and the large magnetocaloric entropy associated with the transformations. Here we describe calorimetric and magnetic studies of four compositions. The results provide a direct measure of entropy change contributions at low temperatures as well as at the first-order phase transitions. Thereby we determine the maximum possible field-induced entropy change corresponding to the giant magnetocaloric effect. We find a large excess entropy change above that of the magnetic moments, but only in compositions with no ferromagnetic order in the high-temperature austenite phase. Furthermore, a molecular field model corresponding to magnetic order in the low-temperature phases is in good agreement, giving an entropy contribution nearly independent of composition, despite significant differences in overall magnetic response of these materials.

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“…The fitted results for T C and J are listed in Table 1. All of these results are in agreement with a local magnetic moment of 4µ B in line with reported studies [30,[32][33][34] and are consistent with local magnetic moments in the sample attributed to manganese with negligible moment on other ions. It is interesting that for Ni-Co-Mn-Sn materials [35] the magnetism exhibits behavior much closer to itinerant magnetism, however in these materials the identical per-Mn moments point to magnetism that is very well represented as composed of local moments on Mn ions.…”

Section: Magnetic Experiments and Calculationsupporting

confidence: 92%

Relative cooling power enhancement by tuning magneto-structural stability in Ni-Mn-In Heusler alloys

Chen

Bruno

Ning

et al. 2018

Journal of Alloys and Compounds

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Off-stoichiometric Ni 2 MnIn Heusler alloys have drawn recent attention due to their large magnetocaloric entropy change associated with the first-order magneto-structural transition. Here we present crystal structural, calorimetric and magnetic studies of three compositions. Temperature-dependent X-ray diffraction shows clear structural transition from a 6M modulated monoclinic to a L2 1 cubic. A significant enhancement of relative cooling power (RCP) was achieved by tuning the magnetic and structural stability through minor compositional changes, with the measured results quantitatively close to the prediction as a function of the ratio between the martensitic transition (T m ) temperature and austenite Curie temperature (T C ) although the maximal magnetic induced entropy change (∆S max ) reduction is observed in the same time. The results provided an evaluation guideline of RCPs as well as magnetic-induced entropy change in designing practical active materials.

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Role of magnetic and atomic ordering in the martensitic transformation of Ni-Mn-In from a first-principles study

Cited by 54 publications

References 46 publications

Calorimetric and magnetic study for Ni50Mn36In14 and relative cooling power in paramagnetic inverse magnetocaloric systems

Calorimetric and magnetic study for Ni50Mn36In14 and relative cooling power in paramagnetic inverse magnetocaloric systems

Direct measure of giant magnetocaloric entropy contributions in Ni–Mn–In

Relative cooling power enhancement by tuning magneto-structural stability in Ni-Mn-In Heusler alloys

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