Magnetoresistance and magnetocaloric properties involving strong metamagnetic behavior in Fe-doped Ni45(Co1−xFex)5Mn36.6In13.4 alloys

Abstract

Here, we report the co-substitution of Fe and Co for Ni atoms on metamagnetic behavior, martensitic transformation, and transport and magnetocaloric properties in Ni 45 (Co 1Àx Fe x) 5 Mn 36.6 In 13.4 (x ¼ 0$0.05) alloys. It is found that the introduction of Fe atoms stabilizes martensitic phase and shifts martensitic temperature (T M) to higher temperature. Meanwhile, the Curie temperature T C of parent phase notably decreases. Upon Fe doping, the low magnetization of martensitic phase keeps nearly unchanged while the magnetization of parent phase slightly decreases. As a result, the Fe-doped samples maintain strong metamagnetic behavior and show great MR and MCE in an extended temperature range around room temperature. The hysteresis loss is reduced upon Fe-doping, which leads to an enhancement of effective RC by 15%. V

Giant magnetic refrigeration capacity near room temperature in Ni40Co10Mn40Sn10 multifunctional alloy

“…The consistency between the results obtained from the ClausiusClapeyron relation and the Maxwell relation, together with the fact that there is no sharp peak on the DS m $ T curves, confirms that our DS m values are reliable. [29][30][31] It is clear from Fig. 3(b) that there is a broad plateau on the curves for higher magnetic fields because complete MFIT can be achieved over a wide temperature range.…”

“…With Eq. (4), the RC value for our alloy was calculated and it is compared to the values for the most studied magnetocaloric materials, [5][6][7]26,28,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] as shown in Fig. 4(a).…”

Magnetic entropy change involving martensitic transition in NiMn-based Heusler alloys

“…Arrows indicate heating and cooling paths. [53] Figure 16(a) displays temperature dependent ZFC and FC magnetizations [65] measured under 0.01 T. One can find that the T C of the parent phase shifts notably to a lower temperature while the martensitic temperature T M shifts to a higher temperature with Fe doping. This fact suggests that a higher Fe content stabilizes the martensitic phase and the PM parent phase.…”

“…Arrows indicate field changing paths. [53] Figures 18(a) and 18(b) shows the representative magnetization isotherms measured around the martensitic transition for x = 0 and 0.05 samples, respectively. Note that the field-induced metamagnetic transition becomes notably steeper with Fe doping but the hysteresis loss (enclosed area in a field cycle) gets smaller.…”

The study of crystal and magnetic properties of MnNi0.85Fe0.15Ge

“…The materials with stable magnetostructural coupling between the structural and the magnetic transition over a broad-temperature region from 70 to 350 K in combination with tunable magnetoresponsive effects are extremely interesting for a practical use. Recently, the possibility to obtain such a combination of properties has been shown for MnNiGe:Fe alloys [1,2].…”