Tuning the metamagnetism in a metallic helical antiferromagnet
Tuning the metamagnetism in a metallic helical antiferromagnet
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调整金属螺旋反铁磁体中的元磁性
DOI：
10.1063/1.5004667
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发表时间：
2017
影响因子：
4
通讯作者：
Zhong Z C
中科院分区：
文献类型：
--
作者：
Ma S C;Liu K;Ma C C;Ge Q;Zhang J T;Hu Y F;Liu E K;Zhong Z C
在MnNiGe螺旋反铁磁体中，Mn/Ni替代FM元素（如Fe或Co）时，观察到马氏体中的反铁磁（AFM）-铁磁（FM）转变。在这里，我们报告了AFM-FM转换，从而在Ni和Mn取代的MnNiGe合金与铟，一个非磁性和大尺寸的主族元素，从顺磁（PM）奥氏体到FM马氏体的急剧磁场驱动的变磁马氏体转变。因此，相对于MnNiGe0.95In0.05合金，在MnNi0.92GeIn0.08中获得磁熵变的两倍增加以及在Mn0.92NiGeIn0.08合金中获得甚至接近三倍增加的巨磁热效应。基于第一性原理计算和X射线吸收光谱结果，讨论了反铁磁-铁磁（AFM-FM）转变以及由此产生的磁场诱导的PM-FM变磁转变的起源，在MnNiGe螺旋反铁磁体中，通过Mn/Ni置换，观察到了反铁磁（AFM）-铁磁（FM）转变.在这里，我们报告了AFM-FM转换，从而在Ni和Mn取代的MnNiGe合金与铟，一个非磁性和大尺寸的主族元素，从顺磁（PM）奥氏体到FM马氏体的急剧磁场驱动的变磁马氏体转变。因此，相对于MnNiGe0.95In0.05合金，在MnNi0.92GeIn0.08中获得磁熵变的两倍增加以及在Mn0.92NiGeIn0.08合金中获得甚至接近三倍增加的巨磁热效应。基于第一性原理计算和X射线吸收光谱结果，讨论了AFM-FM转换和由此产生的急剧磁场诱导PM-FM变磁转变的起源。
The antiferromagnetic (AFM)-ferromagnetic (FM) conversion in martensite was observed in Mn/Ni-substitution upon FM elements, such as Fe or Co, in MnNiGe helical antiferromagnets. Here, we report an AFM-FM conversion and consequently a sharp magnetic-field-driven metamagnetic martensitic transformation from paramagnetic (PM) austenite to FM martensite in the Ni- and Mn-substituted MnNiGe alloys with indium, a non-magnetic and large-sized main group element. Accordingly, a giant magnetocaloric effect such that a twofold increase of the magnetic entropy change in MnNi0.92GeIn0.08 and even a nearly threefold increase in the Mn0.92NiGeIn0.08 alloy is obtained with respect to the MnNiGe0.95In0.05 alloy. The origin of AFM-FM conversion and resultantly sharp magnetic-field-induced PM-FM metamagnetic transformation is discussed based on the first-principles calculations and X-ray absorption spectroscopic results.The antiferromagnetic (AFM)-ferromagnetic (FM) conversion in martensite was observed in Mn/Ni-substitution upon FM elements, such as Fe or Co, in MnNiGe helical antiferromagnets. Here, we report an AFM-FM conversion and consequently a sharp magnetic-field-driven metamagnetic martensitic transformation from paramagnetic (PM) austenite to FM martensite in the Ni- and Mn-substituted MnNiGe alloys with indium, a non-magnetic and large-sized main group element. Accordingly, a giant magnetocaloric effect such that a twofold increase of the magnetic entropy change in MnNi0.92GeIn0.08 and even a nearly threefold increase in the Mn0.92NiGeIn0.08 alloy is obtained with respect to the MnNiGe0.95In0.05 alloy. The origin of AFM-FM conversion and resultantly sharp magnetic-field-induced PM-FM metamagnetic transformation is discussed based on the first-principles calculations and X-ray absorption spectroscopic results.