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• W2019291605 endingPage "310" @default.
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• W2019291605 abstract "The paper reports on recent considerable improvements in electron energy loss spectroscopy (EELS) of spin waves in ultra-thin films. Spin wave spectra with 4 meV resolution are shown. The high energy resolution enables the observation of standing modes in ultra-thin films in the wave vector range of 0.15 Å − 1 < q || < 0.3 Å − 1 . In this range, Landau damping is comparatively small and standing spin wave modes are well-defined Lorentzians for which the adiabatic approximation is well suited, an approximation which was rightly dismissed by Mills and collaborators for spin waves near the Brillouin zone boundary. With the help of published exchange coupling constants, the Heisenberg model, and a simple model for the spectral response function, experimental spectra for Co-films on Cu(100) as well as for Co films capped with further copper layers are successfully simulated. It is shown that, depending on the wave vector and film thickness, the most prominent contribution to the spin wave spectrum may come from the first standing mode, not from the so-called surface mode. In general, the peak position of a low-resolution spin wave spectrum does not correspond to a single mode. A discussion of spin waves based on the “dispersion” of the peak positions in low resolution spectra is therefore subject to errors. • Recent advances in low energy electron spectroscopy of thin-film spin waves • Spin waves in ultra-thin cobalt films are resolved with 4 meV resolution. • Standing spin waves in ultra-thin cobalt films are observed. • Spectra are successfully modeled within the adiabatic approximation. • Previous low resolution spectra of spin waves consist of several modes." @default.
• W2019291605 created "2016-06-24" @default.
• W2019291605 creator A5044998870 @default.
• W2019291605 date "2014-12-01" @default.
• W2019291605 modified "2023-09-24" @default.
• W2019291605 title "High resolution electron energy loss spectroscopy of spin waves in ultra-thin film — The return of the adiabatic approximation?" @default.
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• W2019291605 doi "https://doi.org/10.1016/j.susc.2014.07.015" @default.
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