Giant magnetic refrigeration capacity near room temperature in Ni40Co10Mn40Sn10 multifunctional alloy

Abstract

We report a giant effective magnetic refrigeration capacity in a Ni40Co10Mn40Sn10 multifunctional alloy. With a large magnetization difference between austenite and martensite, this alloy shows a strong magnetic field dependence of transformation temperatures. Complete magnetic-field-induced structural transformation and a considerable magnetic entropy change are observed in a broad operating temperature window of 33 K near room temperature. Consequently, an effective magnetic refrigeration capacity of 251 J/kg for 5 T is achieved, which is the largest value for Ni-Mn-based Heusler alloys and comparable to that of the high-performance Gd-Si-Ge and La-Fe-Si magnetocaloric materials. Incorporating the advantages of low cost and non-toxicity, this alloy shows very promising prospects for room-temperature magnetic refrigeration.

Wheel speed-dependent martensitic transformation and magnetocaloric effect in Ni–Co–Mn–Sn ferromagnetic shape memory alloy ribbons

“…These properties are associated with the magnetic-field-induced martensitic transformation (MT) from the high-temperature ferromagnetic (FM) austenite phase to the low-temperature weak magnetic (WM) martensite phase in Ni-Mn-based FSMAs [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Therefore, controlling phase transition to achieve MT with a large magnetization difference (DM) in a wide temperature range that covers room temperature (RT) is significant in the practical applications of Ni-Mn-based FSMAs.…”

“…Considerable efforts have been exerted to control MT in Ni-Mn-based FSMAs. These efforts include adjusting the elemental chemical composition [4,5,[15][16][17][18][19][20], substituting partial Ni/ Mn or X atoms [7][8][9]21], doping the interstitial atoms [6], and applying the external pressure [22].…”

“…In the past years, many studies have been performed on the off-stoichiometric Ni-Mn-X (X = In, Sn, Sb) intermetallic compounds as multifunctional ferromagnetic shape memory alloys (FSMAs) because of their outstanding multifunctional properties, such as magnetic shape memory [1,2], magnetic superelasticity [3], magnetocaloric effect (MCE) [4][5][6][7][8][9][10][11], magnetoresistance [11,12], magnetothermal conductivity [13], and capacity to directly convert heat to electricity [14]. These properties are associated with the magnetic-field-induced martensitic transformation (MT) from the high-temperature ferromagnetic (FM) austenite phase to the low-temperature weak magnetic (WM) martensite phase in Ni-Mn-based FSMAs [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Conventional and inverse magnetocaloric effects, and critical behaviors in Ni43Mn46Sn8In3 alloy

“…Here, dT FWHM is the full width at half maximum of the DS m (T) curve. [14], and Ni 40 Co 10 Mn 40 Sn 10 (RC MeA ¼ 251 J kg À1 at 50 kOe) [16]. The large MC effects obtained from Ni 43 Mn 46 Sn 8 In 3 over a wide-temperature range near room temperature reveal that this material system can be used in refrigeration applications.…”

Atomic order and martensitic transformation entropy change in Ni–Co–Mn–In metamagnetic shape memory alloys

“…Some Ni-Mn-X off-stoichiometric Heusler compounds (X = In, Sn, Sb) exhibit a magnetostructural transformation from ferromagnetic austenite (L2 1 crystal structure featuring nearest and next-nearest neighbors atomic ordering in a basic BCC lattice) to a weakly magnetic martensite. The magnetostructural coupling gives rise to additional giant magnetocaloric or magnetoresistance effects [2][3][4][5] and other interesting fundamental phenomena. One such fundamental topic is the temperature dependence of the martensitic transformation (MT) entropy change, DS tr ¼ S mart À S aust , manifested by a steep decrease of DS tr (in absolute values) with increasing difference between the austenite Curie temperature, T A C , and the MT temperature, T tr .…”