First-principles investigation of the structural and electronic properties of bulk full-Heusler alloy Mn2CoSn and its (001) surface

First-principles investigation of the structural and electronic properties of bulk full-Heusler alloy Mn2CoSn and its (001) surface
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大块全霍斯勒合金Mn2CoSn及其(001)表面结构和电子性能的第一性原理研究

DOI:
10.1016/j.jallcom.2013.02.181
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发表时间:
2013-07
影响因子:
6.2
通讯作者:
Yao, Kai-Lun
Yao, Kai-Lun
中科院分区:
材料科学2区
文献类型:
--
作者:
Al-zyadi, Jabbar M. Khalaf;Gao, G. Y.;Yao, Kai-Lun

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本文采用第一性原理计算方法研究了Mn 2CoSn体相和(001)面的电子和磁性。在平衡晶格常数为5.85 μ C时,Mn_2CoSn Heusler合金是半金属亚铁磁体,每个分子式单位的总磁矩为3.0μ B。全Heusler合金表现出斯莱特-鲍林行为,总磁矩(Mtot)与价电子总数(Ztot)符合规则Mtot=(Ztot-24)。研究电子态密度,我们发现,半金属性证实在块体Mn 2CoSn被破坏的Mn(2)Sn-和Mn(1)Co终止(001)表面。此外,我们发现在Mn(2)Sn终止的(001)表面的原子磁矩相比于体相Mn 2CoSn的原子磁矩增加,而在Mn(1)Co终止的(001)表面的原子磁矩增加。有趣的是,在Mn(1)Co终止的(001)表面,Mn(1)原子的自旋态从低自旋态转变为高自旋态,这使得Mn 2CoSn全Heusler合金成为自旋电子学应用的一个有希望的候选者.
In this paper, the first-principles calculations have been performed to study the electronic and magnetic properties of the bulk and (001) surface of Mn2CoSn. The bulk Mn2CoSn Heusler alloy is found to be a half-metallic ferrimagnet with a total magnetic moment of 3.0μBper formula unit at the equilibrium lattice constant of 5.85Ǻ. The full-Heusler alloy displays a Slater-Pauling demeanor and the total magnetic moment (Mtot) with the total number of valence electrons (Ztot) complying the rule Mtot=(Ztot-24). Investigating the electronic density of states, we discover that the half-metallicity confirmed in the bulk Mn2CoSn is destroyed at both the Mn(2)Sn- and Mn(1)Co-terminated (001) surfaces. Moreover, we find the atomic magnetic moments at the Mn(2)Sn-terminated (001) surface are increased compared to those of the bulk Mn2CoSn, while they increase at the Mn(1)Co-terminated (001) surface. Interestingly, the spin state of Mn(1) atom is turned from low-spin state to high-spin state at the Mn(1)Co-terminated (001) surface, which makes Mn2CoSn full-Heusler alloy a promising candidate for spintronic applications.
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