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Method of analysis of neutron polarization using noncentrosymmetric cubic helicoidal magnets

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Abstract

A new way of analyzing the polarization of thermal and cold neutron beams, based on the dependence of the neutron-scattering cross section on the neutron polarization upon diffraction from a magnetic spiral, is proposed. In this method, the working element of the neutron-polarization analyzer is a single-crystal noncentrosymmetric cubic helicoidal MnSi magnet, the spin spiral in which is formed at T < T c (T c = 29 K) in the magnetic-field range H < H C2 ∼ 500 mT. Since the spiral period d in MnSi is 180 Å, thermal and cold neutrons with wavelengths λ ≤ 2d diffract from this structure. It is established that the efficiency of neutron-polarization analysis is as high as 100% with the experimental geometry when the polarization vector P is parallel to the scattering vector Q.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, St. Petersburg, 188300, Russia

    N. M. Chubova, V. A. Dyadkin, E. V. Moskvin & S. V. Grigoriev

  2. St. Petersburg State University, St. Petersburg, 198504, Russia

    E. V. Moskvin & S. V. Grigoriev

  3. European Synchrotron Radiation Facility, Grenoble, France

    V. A. Dyadkin

Authors
  1. N. M. Chubova
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  2. V. A. Dyadkin
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  3. E. V. Moskvin
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  4. S. V. Grigoriev
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Correspondence to N. M. Chubova.

Additional information

Original Russian Text © N.M. Chubova, V.A. Dyadkin, E.V. Moskvin, S.V. Grigoriev, 2014, published in Poverkhnost’. Rentgenovskie, Sinkhrotronnye i Neitronnye Issledovaniya, 2014, No. 10, pp. 64–70.

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Chubova, N.M., Dyadkin, V.A., Moskvin, E.V. et al. Method of analysis of neutron polarization using noncentrosymmetric cubic helicoidal magnets. J. Surf. Investig. 8, 1020–1026 (2014). https://doi.org/10.1134/S1027451014050267

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  • DOI: https://doi.org/10.1134/S1027451014050267

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