Ferromagnetic structures in Mn2CoGa and Mn2CoAl doped by Co, Cu, V, and Ti

Ferromagnetic structures in Mn2CoGa and Mn2CoAl doped by Co, Cu, V, and Ti
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Co、Cu、V 和 Ti 掺杂的 Mn2CoGa 和 Mn2CoAl 中的铁磁结构

DOI:
10.1063/1.4796097
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发表时间:
2012-10
影响因子:
3.2
通讯作者:
Wu, G.H.
Wu, G.H.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang, Y.J.;Li, G.J.;Liu, E.K.;Chen, J.L.;Wang, W.H.;Wu, G.H.

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通过实验和计算研究了掺杂Heusler合金Mn_2CoGa和Mn_2CoAl的结构和磁性。系统中的主族元素Ga或Al被磁性或非磁性过渡金属Co、Cu、V和Ti取代。发现了Co-Mn-Co、Mn-Co-Mn和Mn-Co-V三种局域铁磁结构,它们嵌入在自然亚铁磁基体中,以不同的增量增加磁化强度。Co-Mn-Co铁磁结构的最大增量为6.18 μ(B)/atom。此外,非磁性Cu的磁化强度增加和V原子具有约1.0 μ(B)的大铁磁矩的有趣的结果已经得到。新加入的Co可以增加交换相互作用能,而在其他替代情况下,通过支持铁磁耦合和显示T-C的变化,可以减少交换相互作用能。电子结构的计算证实了当三种铁磁结构都达到时,d-d杂化很强。还发现,Ga和Al的共价键决定了局部铁磁结构的产生和对掺杂剂含量的耐受性。(C)2013年美国物理学会。[http://dx.doi.org/10.1063/1.4796097]
The structure and magnetic properties in doped Heusler alloys of Mn2CoGa and Mn2CoAl have been investigated by experiments and calculations. The main group elements of Ga or Al in the systems are substituted by the magnetic or non-magnetic transition metals, Co, Cu, V, and Ti. Three kinds of local ferromagnetic structures, Co-Mn-Co, Mn-Co-Mn, and Mn-Co-V, have been found. They embed in the native ferrimagnetic matrix and increase the magnetization with different increments. The Co-Mn-Co ferromagnetic structure shows the largest increment of 6.18 mu(B)/atom. In addition, interesting results for non-magnetic Cu increasing the magnetization and the V atom having a large ferromagnetic moment of about 1.0 mu(B) have been obtained. The exchange interaction energy can be increased by the newly added Co and depleted by supporting a ferromagnetic coupling in other substitution cases and showing the variation of the T-C. Our calculation of electronic structure verifies the strong d-d hybridization when the three ferromagnetic structures are achieved. It has also been found that the covalent bonding from the Ga and Al determines the generation of the local ferromagnetic structure and the tolerance for dopant content. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4796097]
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