Magnetic properties and magnetocaloric effect in Pt doped Ni-Mn-Ga

被引：22

作者：

Singh, Sanjay ^{[1
,2
]}

D'Souza, S. W. ^{[1
]}

Mukherjee, K. ^{[3
]}

Kushwaha, P. ^{[3
]}

Barman, S. R. ^{[1
]}

Agarwal, Sandeep ^{[4
]}

Mukhopadhyay, P. K. ^{[4
]}

Chakrabarti, Aparna ^{[5
]}

Sampathkumaran, E. V. ^{[3
]}

机构：

[1] UGC DAE Consortium Sci Res, Indore 452001, Madhya Pradesh, India

[2] Saha Inst Nucl Phys, Surface Phys Div, Kolkata 700064, India

[3] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

[4] SN Bose Natl Ctr Basic Sci, LCMP, Kolkata 700098, W Bengal, India

[5] Raja Rammana Ctr Adv Technol, Indore 452013, Madhya Pradesh, India

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 23期

关键词：

SHAPE-MEMORY ALLOYS; FIELD-INDUCED STRAINS; POTENTIAL MODEL; ENTROPY CHANGE; APPROXIMATION; PHASE; SPIN;

D O I：

10.1063/1.4883404

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Large magnetocaloric effect is observed in Ni1.8Pt0.2MnGa close to room temperature. The entropy change shows a crossover from positive to negative sign at the martensite transition. It is negative above 1.6 T and its magnitude increases linearly with magnetic field. An increase in the saturation magnetic moment is observed with Pt doping in Ni2MnGa. Ab initio theoretical calculations show that the increase in magnetic moment with Pt doping in Ni2MnGa is associated with increase in the Mn and Pt local moments in the ferromagnetic ground state. The Curie temperature calculated from the exchange interaction parameters is in good agreement with experiment, showing the absence of any antiferromagnetic correlation due to Pt doping. (C) 2014 AIP Publishing LLC.

引用

页数：5

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