Multiple magnetic transitions and associated room temperature magneto-functionality in Ni2.048Mn1.312In0.64

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:405

Article

Pramanick, S.¹  Dutta, P.²  Chatterjee, S.²  Giri, S.¹  Majumdar, S.¹ 

[1] Indian Assoc Cultivat Sci, Dept Solid State Phys, 2A & B Raja SC Mullick Rd, Kolkata 700032, India

[2] UGC DAE Consortium Sci Res, Kolkata Ctr, Sector 3,LB 8, Kolkata 700098, India

关键词: Heusler phases;    Martensitic phase transformation;    Ferromagnetic shape memory alloy;    Magnetoresistance;    Magnetocaloric effect;   

DOI  :  10.1016/j.jmmm.2016.01.014

来源: Elsevier

【 摘 要 】

Present work reports on the observation of multiple magnetic transitions in a Ni-excess ferromagnetic shape memory alloy with nominal composition Ni2.048Mn1.312In0.64. The magnetization data reveal two distinct thermal hystereses associated with two different phase transitions at different temperature regions. The high temperature magnetic hysteresis is due to the martensitic phase transition whereas the low temperature hysteresis occurs around the magnetic anomaly signifying the transition from a paramagnetic -like state to the ferromagnetic ground state within the martensite. Clear thermal hysteresis along with the sign of the curvatures of Arrott plot curves confirm the first -order nature of both the transitions. In addition, the studied alloy is found to be functionally rich with the observation of large magnetoresistance (-45% and -4% at 80 kOe) and magnetocaloric effect (+16.7 J kg(-1) K-1 and -2.25 J kg(-1) K-1 at 50 kOe) around these two hysteresis regions (300 K and 195 K respectively). (C) 2016 Elsevier B.V. All rights reserved.

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