Abstract
Exchange bias effect observed in the Ni1.68Co0.32Mn1.20Ga0.80 alloy confirms the coexistence of antiferromagnetic and ferromagnetic phases in the martensite phase. A large inverse magnetocaloric effect has been observed within the martensitic transformation temperature range, which is originated from modified magnetic order through magnetic-field-induced phase transformation from partially antiferromagnetic martensite to ferromagnetic austenite. The magnetic entropy change is 16.2 J kg−1 K−1 at 232 K under ΔH = 60 kOe, with the net refrigerant capacity of 68 J kg−1. These properties indicate Co and Mn co-doped Ni2MnGa alloy is a multifunctional material potentially suitable for magnetic refrigeration and spintronics applications.
Highlights
IntroductionStoichiometric Ni2MnGa is a full Heusler alloy that undergoes two separate transitions on cooling:
Stoichiometric Ni2MnGa is a full Heusler alloy that undergoes two separate transitions on cooling:(i) a magnetic transition (paramagnetic-ferromagnetic (FM) transition in the austenite) at Tc = 376 K, and (ii) a structural transition (martensitic transformation (MT) from austenite to martensite) at TM = 202 K [1]
We report the IMCE in
Summary
Stoichiometric Ni2MnGa is a full Heusler alloy that undergoes two separate transitions on cooling:. MCE (IMCE, namely, positive ΔSM) phenomenon has been reported in several Ni-Mn-Ga alloys under application of low magnetic field, arising from the coupling between the martensitic and magnetic domains at the mesoscale [4], i.e., magnetization change due to martensite reorientation associated with the high magnetic anisotropy. This process cannot result in a true ΔSM since it is originated from the field dependent change of magnetic order parameter [7]. The observation of exchange bias (EB) effect confirms the coexistence of AFM and FM phases in the martensitic state
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