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  • 1
    Electronic Resource
    Electronic Resource
    Depth Profiling by Combined SIMS-ESDMS Analysis: a New Surface Analytical Technique (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 155-160 
    Details
    ISSN: 0142-2421
    Keywords: a new surface analytical technique ; SIMS ; ESDMS ; SIMS-ESDMS technique ; depth profiling ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electron-stimulated desorption mass spectrometry (ESDMS), a new technique based on the mass analysis of ions desorbed by a high-energy (several keV) electron beam, has analytical features that complement SIMS. The ESDMS has high sensitivity in the surface analysis of both adsorbates and the first one or two monolayers of substrate constituents. The variations in ESDMS signal intensities and in the sampling surface depth with time were negligible even in a one-monolayer sample. Using this combined SIMS-ESDMS technique, depth profiling analysis was performed for several different metal layers deposited on wafers and for a boron-implanted wafer. The sample depth was changed by sputtering with an ion beam, and the surface analysis at each depth was done by ESDMS with the ion beam off. The ion profiles by SIMS-ESDMS closely coincided with the SIMS profiles. The SIMS-ESDMS technique should be particularly useful for thin layered samples, because the signal-to-noise ratio can be improved by accumulating the ESDMS signals for as long as required without changing the sampling depth under continuous bombardment by the electron beam. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
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    Nonreciprocity of spin waves in the conical helix state (2021)
    National Academy of Sciences
    Details
    Publication Date: 2021-02-19
    Description: Nonreciprocity emerges in nature and in artificial objects from various physical origins, being widely utilized in contemporary technologies as exemplified by diode elements in electronics. While most of the nonreciprocal phenomena are realized by employing interfaces where the inversion symmetry is trivially lifted, nonreciprocal transport of photons, electrons, magnons, and possibly phonons also emerge in bulk crystals with broken space inversion and time reversal symmetries. Among them, directional propagation of bulk magnons (i.e., quanta of spin wave excitation) is attracting much attention nowadays for its potentially large nonreciprocity suitable for spintronic and spin-caloritronic applications. Here, we demonstrate nonreciprocal propagation of spin waves for the conical spin helix state in Cu2OSeO3 due to a combination of dipole and Dzyaloshinskii–Moriya interactions. The observed nonreciprocal spin dispersion smoothly connects to the hitherto known magnetochiral nonreciprocity in the field-induced collinear spin state; thus, all the spin phases show diode characteristics in this chiral insulator.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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