Exchange Bias and Inverse Magnetocaloric Effect in Co and Mn Co-Doped Ni2MnGa Shape Memory Alloy

Metals

Baomin Wang¹ 

[1] School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; E-Mail

关键词: shape memory alloy;    exchange bias;    inverse magnetocaloric effect;    Ni-Mn-Ga;    martensitic transformation;   

DOI  :  10.3390/met3010069

来源: mdpi

【 摘 要 】

Exchange bias effect observed in the Ni_1.68Co_0.32Mn_1.20Ga_0.80 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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.