Magnetism in transition-metal-doped ZnO: A first-principles study

Magnetism in transition-metal-doped ZnO: A first-principles study
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过渡金属掺杂 ZnO 中的磁性:第一性原理研究

DOI:
10.1063/1.4739450
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发表时间:
2012-07
影响因子:
3.2
通讯作者:
Zhang, Xi
Zhang, Xi
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Gu, Gangxu;Xiang, Gang;Luo, Jia;Ren, Hongtao;Lan, Mu;He, Duanwei;Zhang, Xi

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用第一性原理计算方法研究了过渡金属(TM)掺杂的氧化锌的磁性和团簇行为。我们证明了Tm(Co,Fe,Ni和Cu)对的类型与ZnO:Tm中能量最稳定的组态之间的关系。进一步的计算表明,Co对没有形成团簇的倾向,如各种实验所证明的,在ZnO:Co样品中,顺磁(PM)状态处于平衡态,没有多余的缺陷,而在非平衡条件下制备的样品可能处于铁磁(FM)状态。最后,对一系列Tm元素的系统研究揭示了由自旋极化和非自旋极化贡献决定的Tm对的不同类型的团簇行为:Co对和Fe对没有形成团簇的倾向,分别表现为PM和FM态,而Ni对和Cu对有聚集倾向,并表现出本征的FM有序。
The magnetic properties and clustering behaviors of the transition-metal (TM)-doped ZnO have been studied by first-principles calculations. We demonstrate the relationship between the types of TM (Co, Fe, Ni, and Cu) pairs and the energetic most stable configurations in ZnO:TM. Further calculations show that Co pairs have no tendency to form clusters, showing paramagnetic (PM) state in ZnO:Co samples in an equilibrium state and without excessive defects, as evidenced by various experiments, while ferromagnetic (FM) state is possible for the samples prepared under non-equilibrium conditions. Finally, systematical studies of a series of TM elements reveal different types of TM pairs in terms of clustering behaviors determined by spin-polarized and non-spin-polarized contributions: Co pairs and Fe pairs have no tendency to form clusters, showing PM and FM states, respectively, while Ni pairs and Cu pairs have a clustering tendency and show intrinsic FM ordering.
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