Realization of multifunctional shape-memory ferromagnets in all-<i>d</i>-metal Heusler phases

Wei, Zheng; Liu, E. K.; Chen, J. H.; Li, Y.; Liu, G. D.; Luo, Hongzhi; Xi, Xuekui; Zhang, H. W.; Wang, W. H.; Wu, Guangheng

doi:10.1063/1.4927058

Cited by 189 publications

(120 citation statements)

References 38 publications

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“…In Ni‐Mn‐X alloys, there are two main types of hybridization: p‐d covalent hybridization and d‐d hybridization . Compared with Mn and Al elements, both Ni and Co elements possess more valence electrons and preferably occupy the (A, C) sites in the alloy . Moreover, the d‐d hybridization bonding between Mn and Co is formed, which have strong FM exchange interactions .…”

Section: Resultsmentioning

confidence: 99%

“…Compared with Mn and Al elements, both Ni and Co elements possess more valence electrons and preferably occupy the (A, C) sites in the alloy . Moreover, the d‐d hybridization bonding between Mn and Co is formed, which have strong FM exchange interactions . In addition, Fe would also tend to occupy the (A, C) sites and enhance the ferromagnetic interactions between Mn atoms in the system .…”

Section: Resultsmentioning

confidence: 99%

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Large Magnetocaloric Effect and Magnetoresistance in Fe and Co Co‐Doped Ni‐Mn‐Al Heusler Alloys

Xuan

Agarwal

et al. 2018

Physica Status Solidi (a)

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The Ni 40 Co 10Àx Fe x Mn 33 Al 17 (x ¼ 4, 6, 8) alloys are prepared by arc-melting method. The crystallographic structure, magnetic and magnetoresistance properties are systematically studied. The large magnetic change is obtained across the martensitic transformation from the ferromagnetic austenite phase to weak-magnetic martensite phase. With the increase in Fe/Co ratio, the martensite transformation temperature shifts to the lower temperature. The large values of magnetoresistance of 33.3, 25.7, and 13.1% are achieved at the field of 3 T for x ¼ 4, x ¼ 6, and x ¼ 8 alloys around the martensitic transformation, respectively. These results indicate that Ni-Fe-Co-Mn-Al alloy provides the motive power for further research in practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Large Magnetocaloric Effect and Magnetoresistance in Fe and Co Co‐Doped Ni‐Mn‐Al Heusler Alloys

Xuan

Agarwal

et al. 2018

Physica Status Solidi (a)

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“…In their austenitic phase most magnetic shape memory alloys exhibit a Heusler structure with d-group elements (Ni and Mn) at the 8c (Ni) and 4a (Mn) positions (in Wyckoff notation), and p-group atoms (Ga, Sn, In,...) at the 4b positions 10 . Recently magnetic shape memory Heusler alloys have been developed with all-d-metal elements 11,12 . In these alloys Ti replaces p-group elements and it has been proved that the d-metal Ti provides a stabilization of the Heusler structure by d-d hybridization between Ti at 4b position and its nearestneighbour element at the 8c or 4a position 12 .…”

Section: Introductionmentioning

confidence: 99%

Giant barocaloric effect in all- d -metal Heusler shape memory alloys

Aznar

Gràcia-Condal

Planes

et al. 2019

Phys. Rev. Materials

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We have studied the barocaloric properties associated with the martensitic transition of a shape memory Heulser alloy Ni50Mn31.5Ti18.5 which is composed of all-d-metal elements. The composition of the sample has been tailored to avoid long range ferromagnetic order in both ausenite and martensite. The lack of ferromagnetism results in a weak magnetic contribution to the total entropy change thereby leading to a large transition entropy change. The combination of such a large entropy change and a relatively large volume change at the martensitic transition gives rise to giant barocaloric properties in this alloy. When compared to other shape memory Heusler alloys, our material exhibits values for adiabatic temperature and isothermal entropy changes significantly larger than values reported so far for this class of materials. Furthermore, our Ni50Mn31.5Ti18.5 also compares favourably to the best state-of-the-art magnetic barocaloric materials.

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“…1(b)] unambiguously indicates that it is most probable to achieve good mechanical properties in the NiMnTi system. Actually these NiMnTi alloys belong to the recently reported all-d-metal NiMnTi material family [53,54].…”

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confidence: 99%

Colossal Elastocaloric Effect in Ferroelastic Ni-Mn-Ti Alloys

et al. 2019

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Energy-efficient and environment-friendly elastocaloric refrigeration, which is a promising replacement of the conventional vapor-compression refrigeration, requires extraordinary elastocaloric properties. Hitherto the largest elastocaloric effect is obtained in small-size films and wires of the prototype NiTi system. Here, we report a colossal elastocaloric effect, well exceeding that of NiTi alloys, in a class of bulk polycrystalline NiMn-based materials designed with the criterion of simultaneously having large volume change across phase transition and good mechanical properties. The reversible adiabatic temperature change reaches a strikingly high value of 31.5 K and the isothermal entropy change is as large as 45 J kg −1 K −1 . The achievement of such a colossal elastocaloric effect in bulk polycrystalline materials should push a significant step forward towards large-scale elastocaloric refrigeration applications. Moreover, our design strategy may inspire the discovery of giant caloric effects in a broad range of ferroelastic materials.

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Realization of multifunctional shape-memory ferromagnets in all-d-metal Heusler phases

Cited by 189 publications

References 38 publications

Large Magnetocaloric Effect and Magnetoresistance in Fe and Co Co‐Doped Ni‐Mn‐Al Heusler Alloys

Large Magnetocaloric Effect and Magnetoresistance in Fe and Co Co‐Doped Ni‐Mn‐Al Heusler Alloys

Giant barocaloric effect in all- d -metal Heusler shape memory alloys

Colossal Elastocaloric Effect in Ferroelastic Ni-Mn-Ti Alloys

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