Spacer induced magnetism and its effect on interlayer exchange coupling in Fe/(Pd, Cu, Au, Ag) multilayered nanowires
Spacer induced magnetism and its effect on interlayer exchange coupling in Fe/(Pd, Cu, Au, Ag) multilayered nanowires
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DOI：
10.1140/epjb/e2011-10921-8
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
P. Panigrahi;M. C. Valsakumar
中科院分区：
文献类型：
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作者：
P. Panigrahi;M. C. Valsakumar
利用第一性原理密度泛函理论研究了一维Fe/Pd、Fe/Cu、Fe/Ag和Fe/Au多层纳米线体系。我们的研究揭示了这些异质结构的结合能的增益，而不管间隔层的性质。我们已经确定了电子结构依赖于磁性的增强，以及层间交换耦合的开关行为，关于非磁性间隔层的性质和尺寸。我们观察到在Fe/Pd纳米线中，铁原子的磁矩增强和Pd的铁磁性行为与体态中出现的顺磁性相反，在Fe/Pd纳米线中，铁原子的下旋（少量）d电荷耗尽和Pd的上旋电荷增益。我们发现Fe/Pd纳米线的层间交换耦合Iex非常强，并且随着Pd间隔宽度的增加，其符号发生变化，幅度减小。另一方面，随着铜间隔层厚度的增加，iex1呈现出不同寻常的增加趋势。
We have investigated the one dimensional Fe/Pd, Fe/Cu, Fe/Ag, and Fe/Au multilayered nanowire systems by using first principles density functional theory. Our study reveals a gain in the binding energies of these heterostructures regardless of nature of the spacer. We have identified the electronic structure dependent enhancement of magnetic properties, and a switching behavior of the interlayer exchange coupling, with respect to the nature and dimension of the nonmagnetic spacer layer. We observe a down-spin (minority)d-charge depletion at the Fe site and a up-spind-charge gain at Pd site in Fe/Pd nanowire which accounts for the enhanced magnetic moment of the Fe atoms and the ferromagnetic behavior of the Pd, in contrast to the paramagnetism appearing in their bulk state. We find the interlayer exchange coupling,Iex, in Fe/Pd nanowire to be very strong, and it shows a change of sign and a decrease in magnitude with increase in Pd spacer width. On the other hand,Iexshows an unusual increasing trend with increase in the Cu spacer layer thickness.