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arXiv 0908.1282cond-mat.mtrl-sci
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Fe/GaAs(110)界面性质的从头算研究

Ab initio study of the interface properties of Fe/GaAs(110)

A. Grünebohm, H. C. Herper, P. Entel

摘要:

用密度泛函理论研究了Fe在GaAs(110)上的初始生长。与通常使用的(001)-表面相反,(110)-表面不重建。因此,Fe/GaAs(110)具有平坦的界面和较小的扩散,这使得Fe/GaAs(110)成为自旋电子学应用的可能候选材料。由于实验上,界面的实际质量似乎取决于生长条件,例如,在通流率方面,我们模拟了不同通流率对半导体表面不同Fe覆盖率的影响。覆盖率低的系统具有高度扩散性。随着Fe量的增加,即,较高的通量率,平坦的界面变得更稳定。磁结构强烈地依赖于Fe覆盖,但在我们的计算中没有观察到磁矩的淬灭。

英文摘要:

We have investigated the initial growth of Fe on GaAs(110) by means of density functional theory. In contrast to the conventionally used (001)-surface the (110)-surface does not reconstruct. Therefore, a flat interface and small diffusion can be expected, which makes Fe/GaAs(110) a possible candidate for spintronic applications. Since experimentally, the actual quality of the interface seems to depend on the growth conditions, e.g., on the flux rate, we simulate the effect of different flux rates by different Fe coverages of the semiconductor surface. Systems with low coverages are highly diffusive. With increasing amount of Fe, i.e., higher flux rates, a flat interface becomes more stable. The magnetic structure strongly depends on the Fe coverage but no quenching of the magnetic moments is observed in our calculations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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