Half-metallic p-electron ferromagnetism in alkaline earth doped AlAs: A first-principles calculation

Half-metallic p-electron ferromagnetism in alkaline earth doped AlAs: A first-principles calculation
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碱土金属掺杂 AlAs 中的半金属 p 电子铁磁性:第一原理计算

DOI:
10.1063/1.3692591
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发表时间:
2012-03
影响因子:
4
通讯作者:
Yong Liu
Yong Liu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhao Yong-Hong;Yong-Feng Li;Yong Liu

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用第一性原理计算方法研究了掺入碱土的稀土中p电子的铁磁性。修正的贝克和约翰逊势被用来给出一个更合理的半导体间隙。我们的结果表明,对于所有考虑的化合物,铁磁相总是比反铁磁相和非磁性相在能量上有利。磁矩主要归因于部分填充的阴离子p态。特别是掺Ca和sr的AlAs具有半金属铁磁性,这在自旋电子应用中具有广阔的前景。计算结果也有助于理解稀磁半导体中铁磁性的来源。
We investigated the p-electron ferromagnetism in alkaline earth doped AlAs by using first-principles calculations. The modified Becke and Johnson potential is used to give a much more reasonable semiconductor gap. Our results demonstrate that ferromagnetic phase is always energetically favorable than the antiferromagnetic and nonmagnetic ones for all considered compounds. Magnetic moments are mainly attributed to the partly filled anionic p states. Especially, half-metallic ferromagnetism has been obtained for Ca- and Sr-doped AlAs, which may be promising for spintronic applications. The calculated results are also useful for understanding of the origin of ferromagnetism in diluted magnetic semiconductors.
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