Pressure induced magnetic and magnetocaloric properties in NiCoMnSb Heusler alloy

Abstract

The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials J. Appl. Phys. 111, 07A334 (2012) Particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2 firstorder systems Appl. Phys. Lett. 100, 072403 (2012) Magnetocaloric effect and refrigerant capacity in 0.44, 0.46 The effect of pressure on the magnetic and the magnetocaloric ͑MC͒ properties around the martensitic transformation temperature in NiCoMnSb Heusler alloy has been studied. The martensitic transition temperature has significantly shifted to higher temperatures with pressure, whereas the trend is opposite with the application of applied magnetic field. The maximum magnetic entropy change around the martensitic transition temperature for Ni 45 Co 5 Mn 38 Sb 12 is 41.4 J/kg K at the ambient pressure, whereas it is 33 J/kg K at 8.5 kbar. We find that by adjusting the Co concentration and applying suitable pressure, NiCoMnSb system can be tuned to achieve giant MC effect spread over a large temperature span around the room temperature, thereby making it a potential magnetic refrigerant material for applications.

Structural, magnetic, magnetocaloric and magnetotransport properties in Ge doped Ni–Mn–Sb Heusler alloys

“…This suggests that the martensite phase gradually gets stabilized with Ge substitution. stabilizes the martensitic phase as in the present case [16]. Therefore, the effect of chemical pressure brought about by Ge seems to play a similar role as that of hydrostatic pressure.…”

“…This would cause a shift of T M towards higher temperature as AFM exchange strengthens with decrease in Mn-Mn distance. As mentioned earlier, application of pressure was found to enhance the T M in NiCoMnSb Heusler alloys [16]. Therefore, the chemical substitution yields the same trend as that of hydrostatic pressure in the system.…”

Magnetic Field-Induced Reverse Martensitic Transformation and Thermal Transformation Arrest Phenomenon of Ni41Co9Mn39Sb11 Alloy

“…In addition, positive pressure dependence of the Curie temperature has been reported by Kaneko et al [26] and Kanomata et al [25]. Since the reports of the occurrence of the martensitic transformation in the off-stoichiometric composition [1], a large number of investigations have been performed and many interesting physical properties have been reported in Ni-Mn-Sb and Co-substituted Ni-Co-Mn-Sb alloys, such as large magnetoresistance [27,28], a negative magnetocaloric effect [29,30], a metamagnetic shape memory effect [31] and exchange biasing behavior [32,33], similar to properties of other NiMn-based alloys. In order to investigate metamagnetic behavior and magnetic moment of the field-induced parent phase of Ni-Co-Mn-Sb alloy, magnetization experiments up to a static magnetic field of 18 T and a pulsed magnetic field of 40 T were performed.…”

In-plane and out of plane magnetic properties in Ni46Co4Mn38Sb12 ribbons

“…In both the cases, the entropy change is found to be positive, indicating the inverse magnetocaloric effect as in the bulk. The temperature corresponding to the maximum MCE values (~13 J/kg.K) is found to be 297 K. It may be noted that the entropy change for the bulk alloy of the same composition is 32 J/kg K. 12 It has also been observed that the average hysteresis loss is almost equal for both the IP and the OP ribbons. The small difference in magnetic anisotropy at these fields is responsible for this similarity.…”