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Article Dans Une Revue Journal of Synchrotron Radiation Année : 2020

Improving the soft X-ray reflectivity of Cr/Ti multilayers by co-deposition of B4C

Jingtao Zhu
  • Fonction : Auteur
Jiayi Zhang
Haochuan Li
  • Fonction : Auteur
Yuchun Tu
  • Fonction : Auteur
Jinwen Chen
  • Fonction : Auteur
Mingqi Cui
  • Fonction : Auteur
Jie Zhu
  • Fonction : Auteur
  • PersonId : 764846
  • IdRef : 19484885X

Résumé

The `water window', covering 2.4–4.4 nm, is an important wavelength range particularly essential to biology research. Cr/Ti multilayers are one of the promising reflecting elements in this region because the near-normal-incidence reflectivity is theoretically as high as 64% at 2.73 nm. However, due to multilayer imperfections, the reported reflectivity is lower than 3% for near-normal incidence. Here, B and C were intentionally incorporated into ultra-thin Cr/Ti soft X-ray multilayers by co-deposition of B4C at the interfaces. The effect on the multilayer structure and composition has been investigated using X-ray reflectometry, X-ray photoelectron spectroscopy, and cross-section electron microscopy. It is shown that B and C are mainly bonded to Ti sites, forming a nonstoichiometric TiBxCy composition, which hinders the interface diffusion, supresses the crystallization of the Cr/Ti multilayer and dramatically improves the interface quality of Cr/TiBxCy multilayers. As a result, the near-normal-incidence reflectivity of soft X-rays increases from 4.48% to 15.75% at a wavelength of 2.73 nm.
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Dates et versions

hal-02995210 , version 1 (09-01-2023)

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Jingtao Zhu, Jiayi Zhang, Haochuan Li, Yuchun Tu, Jinwen Chen, et al.. Improving the soft X-ray reflectivity of Cr/Ti multilayers by co-deposition of B4C. Journal of Synchrotron Radiation, 2020, 27 (6), pp.1614-1617. ⟨10.1107/S1600577520011741⟩. ⟨hal-02995210⟩
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