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Surface spin waves of fcc cobalt films on Cu(100): High-resolution spectra and comparison to theory

机译：Cu（100）上fcc钴膜的表面自旋波：高分辨率光谱和与理论的比较

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摘要

With the help of a recently developed electron energy-loss spectrometer we have studied the surface spin waves on an eight-monolayer cobalt film deposited on Cu(100) surfaces with unprecedented energy resolution. Standing waves of the bulk of the film are discovered in the region of small wave vectors q‖ < 0.35 A~(-1). The dispersion of surface spin waves is isotropic even for large q‖. Because of the high-energy resolution and the complete characterization of the electron optical properties of the spectrometer reliable data for the linewidth of the surface spin waves are obtained. As a byproduct the dispersion of the Rayleigh surface phonon was measured. Data are compared to theoretical spin wave spectra extracted from calculations of the transverse spin susceptibility based on an ab initio electronic structure that incorporates both the metallic substrate and the magnetic film. The calculation takes fully into account the itinerant nature of the electrons responsible for the magnetic moments. The agreement between theoretical and experimental spin wave energies and linewidths is remarkably good.
机译：借助最近开发的电子能量损失谱仪，我们研究了以前所未有的能量分辨率沉积在Cu（100）表面上的八层单层钴膜上的表面自旋波。在小波矢q′<0.35 A〜（-1）的区域内发现了大部分薄膜的驻波。即使对于较大的q′，表面自旋波的色散也是各向同性的。由于高能量分辨率和光谱仪电子光学特性的完整表征，因此获得了表面自旋波线宽的可靠数据。作为副产物，测量了瑞利表面声子的分散。将数据与从基于自发电子结构的横向自旋磁化率计算中提取的理论自旋波谱进行比较，该自发电子结构同时包含金属基板和磁性膜。该计算充分考虑了引起磁矩的电子的迭代特性。理论和实验自旋波能量与线宽之间的一致性非常好。

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  • 来源
    《Physical review》 |2012年第16期|165436.1-165436.11|共11页
  • 作者

    J. Rajeswari; H. Ibach; C. M. Schneider; A. T. Costa; D. L. R. Santos; D. L. Mills;

  • 作者单位

    Peter Gruenberg Institut (PGI-6), Forschungszentrum Juelich, 52425 Juelich, Germany,Juelich Aachen Research Alliance, Germany;

    Peter Gruenberg Institut (PGI-3), Forschungszentrum Juelich, 52425 Juelich, Germany,Juelich Aachen Research Alliance, Germany;

    Peter Gruenberg Institut (PGI-6), Forschungszentrum Juelich, 52425 Juelich, Germany,Juelich Aachen Research Alliance, Germany;

    Instituto de Fisica, Universidade Federal Fluminense, 24210-346 Niteroi, R. J., Brazil;

    Instituto de Fisica, Universidade Federal Fluminense, 24210-346 Niteroi, R. J., Brazil;

    Department of Physics and Astronomy, University of California, Irvine, California 92697, USA;

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  • 正文语种 eng
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  • 关键词

    spin waves;

    机译：自旋波;

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