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First-principles investigation of spin-wave dispersions in surface-reconstructed Co thin films on W(110)

机译:W(110)表面重构Co薄膜中自旋波色散的第一性原理研究

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摘要

We computed spin-wave dispersions of surface-reconstructed Co films on the W(110) surface in the adiabatic approximation. The magnetic exchange interactions are obtained via first-principles electronic-structure calculations using the Korringa-Kohn-Rostoker Green-function method. We analyze the strength and oscillatory behavior of the intralayer and interlayer magnetic interactions and investigate the resulting spin-wave dispersions as a function of the thickness of Co films. In particular, we highlight and explain the strong impact of hybridization of the electronic states at the Co-W interface on the magnetic exchange interactions and on the spin-wave dispersions. We compare our results to recent measurements based on electron-energy-loss spectroscopy [E. Michel, H. Ibach, and C. M. Schneider, Phys. Rev. B 92, 024407 (2015)]. Good overall agreement with experimental findings can be obtained by considering the possible overestimation of the spin splitting, stemming from the local-spin-density approximation, and adopting an appropriate correction.
机译:我们以绝热近似计算了W(110)表面上表面重构Co膜的自旋波色散。通过使用Korringa-Kohn-Rostoker Green函数方法的第一性原理电子结构计算获得了磁交换相互作用。我们分析了层间和层间磁相互作用的强度和振荡行为,并研究了产生的自旋波频散随Co膜厚度的变化。特别是,我们重点介绍并解释了Co-W界面上电子态的混合对磁交换相互作用和自旋波色散的强烈影响。我们将我们的结果与基于电子能量损失谱法[E. Michel,H。Ibach和C.M. Schneider,物理学。 Rev.B 92,024407(2015)]。通过考虑自旋分裂的可能过高估计(基于局部自旋密度近似值)并采用适当的校正,可以获得与实验结果的良好总体一致性。

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  • 来源
    《Physical review》 |2017年第13期|134408.1-134408.12|共12页
  • 作者单位

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschuneszentrum Juelich & JARA, D-52425 Juelich, Germany;

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschuneszentrum Juelich & JARA, D-52425 Juelich, Germany;

    Peter Gruenberg Institut and Institute for Advanced Simulation, Forschuneszentrum Juelich & JARA, D-52425 Juelich, Germany;

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