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Title: Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields

Abstract

The presence of a large applied magnetic field removes the degeneracy of the vacuum energy states for spin-up and spin-down neutrons. For polarized neutron reflectometry, this must be included in the reference potential energy of the Schrödinger equation that is used to calculate the expected scattering from a magnetic layered structure. For samples with magnetization that is purely parallel or antiparallel to the applied field which defines the quantization axis, there is no mixing of the spin states (no spin-flip scattering) and so this additional potential is constant throughout the scattering region. When there is non-collinear magnetization in the sample, however, there will be significant scattering from one spin state into the other, and the reference potentials will differ between the incoming and outgoing wavefunctions, changing the angle and intensities of the scattering. In conclusion, the theory of the scattering and recommended experimental practices for this type of measurement are presented, as well as an example measurement.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1311226
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Crystallography (Online)
Additional Journal Information:
Journal Name: Journal of Applied Crystallography (Online); Journal Volume: 49; Journal Issue: 4; Journal ID: ISSN 1600-5767
Publisher:
International Union of Crystallography
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; polarized neutron reflectometry; applied magnetic fields; Zeeman corrections; non-collinear magnetization

Citation Formats

Maranville, Brian B., Kirby, Brian J., Grutter, Alexander J., Kienzle, Paul A., Majkrzak, Charles F., Liu, Yaohua, and Dennis, Cindi L. Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields. United States: N. p., 2016. Web. https://doi.org/10.1107/S1600576716007135.
Maranville, Brian B., Kirby, Brian J., Grutter, Alexander J., Kienzle, Paul A., Majkrzak, Charles F., Liu, Yaohua, & Dennis, Cindi L. Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields. United States. https://doi.org/10.1107/S1600576716007135
Maranville, Brian B., Kirby, Brian J., Grutter, Alexander J., Kienzle, Paul A., Majkrzak, Charles F., Liu, Yaohua, and Dennis, Cindi L. Thu . "Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields". United States. https://doi.org/10.1107/S1600576716007135. https://www.osti.gov/servlets/purl/1311226.
@article{osti_1311226,
title = {Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields},
author = {Maranville, Brian B. and Kirby, Brian J. and Grutter, Alexander J. and Kienzle, Paul A. and Majkrzak, Charles F. and Liu, Yaohua and Dennis, Cindi L.},
abstractNote = {The presence of a large applied magnetic field removes the degeneracy of the vacuum energy states for spin-up and spin-down neutrons. For polarized neutron reflectometry, this must be included in the reference potential energy of the Schrödinger equation that is used to calculate the expected scattering from a magnetic layered structure. For samples with magnetization that is purely parallel or antiparallel to the applied field which defines the quantization axis, there is no mixing of the spin states (no spin-flip scattering) and so this additional potential is constant throughout the scattering region. When there is non-collinear magnetization in the sample, however, there will be significant scattering from one spin state into the other, and the reference potentials will differ between the incoming and outgoing wavefunctions, changing the angle and intensities of the scattering. In conclusion, the theory of the scattering and recommended experimental practices for this type of measurement are presented, as well as an example measurement.},
doi = {10.1107/S1600576716007135},
journal = {Journal of Applied Crystallography (Online)},
number = 4,
volume = 49,
place = {United States},
year = {2016},
month = {6}
}

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    Optimization of reflectometry experiments using information theory
    journal, February 2019

    • Treece, Bradley W.; Kienzle, Paul A.; Hoogerheide, David P.
    • Journal of Applied Crystallography, Vol. 52, Issue 1
    • DOI: 10.1107/s1600576718017016