Intermartensitic Transformation and Enhanced Exchange Bias in Pd (Pt) -doped Ni-Mn-Sn alloys.
Intermartensitic Transformation and Enhanced Exchange Bias in Pd (Pt) -doped Ni-Mn-Sn alloys.
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Pd(Pt) 掺杂 Ni-Mn-Sn 合金中的马氏体相变和增强交换偏压
DOI：
10.1038/srep25911
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发表时间：
2016-05-12
影响因子：
4.6
通讯作者：
Jiang XF
中科院分区：
文献类型：
--
作者：
Dong SY;Chen JY;Han ZD;Fang Y;Zhang L;Zhang CL;Qian B;Jiang XF
本文研究了Ni 50 − xMn 36 Sn 14 Tx（T = Pd，Pt; x = 0，1，2，3）合金的相变和交换偏置。在Ni 50 − xMn 36 Sn 14 Tx（T = Pd，Pt）合金中，通过适当施加负化学压，引入了在Ni 50 Mn 36 Sn 14合金中未观察到的中间马氏体转变（IMT）。IMT随外加电场的增加而减弱并受到抑制;随着Pd（Pt）含量的进一步增加（Pd为x = 3，Pt为x = 2），IMT也消失。另一个引人注目的结果是，交换偏置效应，归因于与自旋玻璃相共存的铁磁畴，被显着增强的Pd（Pt）的添加。通过自旋玻璃相的Dzyaloshinsky-Moriya相互作用解释了Pd（Pt）杂质的加入对单向各向异性的增强作用。
In this work, we studied the phase transitions and exchange bias of Ni50−xMn36Sn14Tx (T = Pd, Pt; x = 0, 1, 2, 3) alloys. An intermartensitic transition (IMT), not observed in Ni50Mn36Sn14 alloy, was induced by the proper application of negative chemical pressure by Pd(Pt) doping in Ni50−xMn36Sn14Tx (T = Pd, Pt) alloys. IMT weakened and was suppressed with the increase of applied field; it also disappeared with further increase of Pd(Pt) content (x = 3 for Pd and x = 2 for Pt). Another striking result is that exchange bias effect, ascribed to the percolating ferromagnetic domains coexisting with spin glass phase, is notably enhanced by nonmagnetic Pd(Pt) addition. The increase of unidirectional anisotropy by the addition of Pd(Pt) impurities with strong spin-orbit coupling was explained by Dzyaloshinsky-Moriya interactions in spin glass phase.