Magnetic phase transition and magneto-caloric effect (MCE) in (Mn0.5Ni0.5)60+xGa40-x (x = 3.3, 5.0, and 6.6) alloys.
In: Journal of Alloys & Compounds, Jg. 883 (2021-11-25), S. N.PAG
academicJournal
Zugriff:
• Three (Mn 0.5 Ni 0.5) 60+ x Ga 40- x skyrmion hosting alloys are fabricated. • Second order magnetic transition was confirmed. • Considerable MCE were observed in rare earth (RE)-free alloys. • Valuable clues for searching RE-free MCE materials. A systematic investigation of rare earth free magnets (Mn 0.5 Ni 0.5) 60+ x Ga 40- x (x = 3.3, 5.0, and 6.6) which are typical skyrmion hosting alloys are presented with respected to the crystal structure, magnetic phase transition and magneto-caloric effect (MCE). All the (Mn 0.5 Ni 0.5) 60+ x Ga 40- x alloys exhibit a hexagonal Ni 2 In-type structure with the P63/mmc space group confirmed by X-ray diffraction. The Mn and Ga/Ni atomic layers arrange alternately along the c -axis. The lattice parameters include a and c all as well as the Curie temperature (T C) all increase gradually with increasing Mn content. A second-ordered phase transitions from the state of ferromagnetic to paramagnetic has been determined around their own T C of 340, 348 and 351 K for (Mn 0.5 Ni 0.5) 63.3 Ga 36.7 , (Mn 0.5 Ni 0.5) 65 Ga 35 and (Mn 0.5 Ni 0.5) 66.6 Ga 33.4 , respectively. Moreover, the MCE performances of (Mn 0.5 Ni 0.5) 60+ x Ga 40- x alloys were determined by the figure merits of the maximum magnetic entropy change (-Δ S M max), temperature-averaged entropy change (TEC) with 5 K-lift and refrigerant capacity (RC). The values of -Δ S M max, TEC (5), and RC are 3.26 J/kg K, 3.24 J/kg K, and 229.9 J/kg for (Mn 0.5 Ni 0.5) 63.3 Ga 36.7 , 3.72 J/kg K, 3.70 J/kg K and 287.3 J/kg for (Mn 0.5 Ni 0.5) 65 Ga 35 , as well as 3.56 J/kg K, 3.53 J/kg K and 265.1 J/kg for (Mn 0.5 Ni 0.5) 66.6 Ga 33.4 under the external applied field change of 0–7 T, respectively. [ABSTRACT FROM AUTHOR]
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Magnetic phase transition and magneto-caloric effect (MCE) in (Mn0.5Ni0.5)60+xGa40-x (x = 3.3, 5.0, and 6.6) alloys.
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Autor/in / Beteiligte Person: | Wang, Xing ; Ma, Zhipan ; Wang, Haifeng ; Li, Lingwei |
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Zeitschrift: | Journal of Alloys & Compounds, Jg. 883 (2021-11-25), S. N.PAG |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 0925-8388 (print) |
DOI: | 10.1016/j.jallcom.2021.160890 |
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