Martensitic phase transition with magnetocaloric effect and double-shifted exchange bias in the martensitic phase for Ni48Mn39Sn13-xGex alloys

被引：3

作者：

Sun, Xiaodong ^{[1
]}

Jing, Chao ^{[1
]}

Liu, Changqin ^{[1
]}

Ye, Miaofu ^{[1
]}

Huang, Yinsheng ^{[1
]}

Zhang, Guojie ^{[1
]}

机构：

[1] Shanghai Univ, Dept Phys, Shanghai, Peoples R China

来源：

PHASE TRANSITIONS | 2019年 / 92卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Heusler alloy; martensitic phase transition; magnetocaloric effect; exchange bias; LENGTH SCALES; TEMPERATURE;

D O I：

10.1080/01411594.2018.1543800

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Ni48Mn39Sn13-xGex (x = 1, 2) Heusler alloys have been prepared, and the martensitic phase transition (MPT), magnetocaloric effect and exchange bias (EB) have been explored. At room temperature, the structure of both samples presents L2(1) type, and the MPT shifts to a higher temperature, while the Curie temperature (T-C) of the austenitic phase decreases with the increase of the Ge content. The maximum magnetic entropy change of Ni48Mn39Sn13-xGex with x = 2 reaches about 14.67 J/kg K under the magnetic field of 5 T during reverse MPT. In addition, an interesting phenomenon is the enhancement of EB with the increase of the Ge content, especially the abnormal presence of the double-shifted hysteresis loop has been realized in Ni48Mn39Sn13-xGex with x = 2, which can be interpreted by the fact that the antiferromagnetic (AFM) regions couple with proximal ferromagnetic (FM) regions in the opposite way at low temperature.

引用

页码：13 / 22

页数：10