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Spin waves in metallic iron and nickel measured by soft x-ray resonant inelastic scattering

机译：通过软X射线共振无弹性散射测量金属铁和镍中的旋转波

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The spin-wave dispersions in iron and nickel along the [111] direction are determined using soft x-ray resonant inelastic x-ray scattering (RIXS). For iron, a 10-nm thin film was studied and, over the limited q range accessible, the peaks disperse as expected for a spin wave and in agreement with inelastic neutron scattering (INS) results. At the higher q values damping is observed with the peaks weakening and broadening. This damping is less pronounced than in the INS studies. The RIXS results are also compared with ab initio spin fluctuation calculations. The calculations slightly underestimate the energy dispersion and the damping is larger than in the measurement. Nevertheless, the agreement between the RIXS results, INS studies, and the theory is quite satisfactory. For the single crystal of nickel, the measured q dispersion flattens out rapidly and the peaks broaden. The strong damping effect is reproduced by the spin fluctuation calculations but the energy of the peaks is largely overestimated. Nevertheless, the flattening of the dispersion is not reproduced by the calculations and, although similar effects were observed in early INS experiments, they are not seen in more recent work. Possible reasons for this are discussed. These measurements show that using soft x-ray RIXS to study spin fluctuations in metallic systems, which are in general very challenging for the technique, has much promise. More interestingly, since the iron measurements were performed on a 10-nm thin film, the study opens the possibility to study tailor-made thin-film samples, which cannot be easily studied by other techniques. Combining these studies with state-of-the-art ab initio calculations opens up interesting prospects for testing our understanding of spin waves in metallic svstems.
机译：使用软X射线共振非弹性X射线散射（RIX）测定沿[111]方向的铁和镍中的旋转波分散体。对于铁，研究了10nm薄膜，并且在有限的Q范围内可接近，峰值如预期的旋转波和与非弹性中子散射（INS）的结果分散。在较高的Q值下，观察到峰值的减弱和扩大。这种阻尼比INS研究不那么明显。 rixs结果也与AB Initio旋转波动计算进行了比较。稍微低估能量分散和阻尼的计算大于测量值。尽管如此，rixs结果之间的协议是令人满意的。对于镍的单晶，测量的Q分散迅速变化，峰宽。通过旋转波动计算再现强度阻尼效果，但峰的能量大大估计。然而，算法不再繁殖分散体，并且尽管在早期的实验中观察到类似的效果，但在更近期的工作中没有看到它们。讨论了可能的可能原因。这些测量表明，使用软X射线rixs研究金属系统中的旋转波动，这在一般对技术方面非常具有挑战性，具有很大的承诺。更有趣的是，由于在10nm薄膜上进行了铁测量，因此该研究开辟了研究量制制备的薄膜样品的可能性，这不能通过其他技术容易地研究。将这些研究与最先进的AB Initio Calculation结合开辟了测试我们在金属SVstems中的旋转波的理解的有趣前景。

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  • 来源
    《Physical review》 |2020年第6期|064412.1-064412.10|共10页
  • 作者

    N. B. Brookes; D. Betto; K. Cao; Yi Lu; K. Kummer; F. Giustino;

  • 作者单位

    ESRF The European Synchrotron 71 Avenue des Martyrs 38043 Grenoble France Diamond Light Source Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE United Kingdom;

    ESRF The European Synchrotron 71 Avenue des Martyrs 38043 Grenoble France Max Planck Institute for Solid State Research Heisenbergstrasse 1 70569 Stuttgart Germany;

    Daresbury Laboratory Daresbury Warrington WA4 4AD United Kingdom;

    Institute for Theoretical Physics Heidelberg University Philosophenweg 19 69120 Heidelberg Germany;

    ESRF The European Synchrotron 71 Avenue des Martyrs 38043 Grenoble France;

    Department of Materials University of Oxford 16 Parks Road Oxford OX1 3PH United Kingdom Oden Institute for Computational Engineering and Sciences The University of Texas at Austin Austin Texas 78712 USA Department of Physics The University of Texas at Austin Austin Texas 78712 USA;

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