Affiliation:
1. Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”
2. St. Petersburg State University
Abstract
The concept of a two-mode neutron reflectometer with a polarizer, two spin-flippers and an analyzer of polarization after passing through the sample is presented. A reflectometer designed for a compact neutron source DARIA is planned to measure the spectrum of a reflected “white” neutron beam using the time-of-flight method at a fixed glancing angle with the possibility of using both polarized and non-polarized neutrons. The main geometric and physical parameters of the neutron reflectometer are presented. With a neutron pulse duration τ = 100 µs and a total length of the time-of-flight base L = 8 m, the pulse repetition rate can reach f = 165 Hz for the wavelength range Δλ = 3 Å and resolution Δλ ≅ 0.05 Å. The use of polarization analysis elements of a reflectometer at a beam polarization exceeding 96% and an efficiency of spin flippers close to unity makes it possible to study magnetic thin-film nanostructures in detail.
Publisher
The Russian Academy of Sciences
Reference15 articles.
1. Боднарчук В.И., Булкин А.П., Кравцов Е.А., Плешанов Н.К., Сыромятников В.Г., Ульянов В.А. // Кристаллография. 2022. Т. 67. № 1. С. 57. https://doi.org/10.31857/S0023476122010040
2. Lauter H.-J., Lauter V., Toperverg B.P. // Polymer Sci. A. 2012. V. 2. P. 411. https://doi.org/10.1016/B978-0-444-53349-4.00033-9
3. Fitzsimmons M.R., Schuller Ivan K. // J. Magn. Magn. Mater. 2014. V. 350. P. 199. https://doi.org/10.1016/j.jmmm.2013.09.028
4. Никитенко Ю.В., Сыромятников В.Г. Рефлектометрия поляризованных нейтронов. М.: Физматлит, 2013. С. 224.
5. Zabel H., Theis-Bröhl K., Toperverg B.P. // The Handbook of Magnetism and Advanced Magnetic Materials, V. 3: Novel Techniques / Ed. Kronmüller H., Parkin S.P.S. New York: Wiley, 2007. P. 1237.