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

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 scatte...

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Autores principales: Maranville, Brian B., Kirby, Brian J., Grutter, Alexander J., Kienzle, Paul A., Majkrzak, Charles F., Liu, Yaohua, Dennis, Cindi L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970493/
https://www.ncbi.nlm.nih.gov/pubmed/27504074
http://dx.doi.org/10.1107/S1600576716007135
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author Maranville, Brian B.
Kirby, Brian J.
Grutter, Alexander J.
Kienzle, Paul A.
Majkrzak, Charles F.
Liu, Yaohua
Dennis, Cindi L.
author_facet Maranville, Brian B.
Kirby, Brian J.
Grutter, Alexander J.
Kienzle, Paul A.
Majkrzak, Charles F.
Liu, Yaohua
Dennis, Cindi L.
author_sort Maranville, Brian B.
collection PubMed
description 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. The theory of the scattering and recommended experimental practices for this type of measurement are presented, as well as an example measurement.
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spelling pubmed-49704932016-08-08 Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields Maranville, Brian B. Kirby, Brian J. Grutter, Alexander J. Kienzle, Paul A. Majkrzak, Charles F. Liu, Yaohua Dennis, Cindi L. J Appl Crystallogr Research Papers 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. The theory of the scattering and recommended experimental practices for this type of measurement are presented, as well as an example measurement. International Union of Crystallography 2016-06-09 /pmc/articles/PMC4970493/ /pubmed/27504074 http://dx.doi.org/10.1107/S1600576716007135 Text en © Brian B. Maranville et al. 2016 http://creativecommons.org/licenses/by/2.0/uk/ This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
spellingShingle Research Papers
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
title Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
title_full Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
title_fullStr Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
title_full_unstemmed Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
title_short Measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
title_sort measurement and modeling of polarized specular neutron reflectivity in large magnetic fields
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970493/
https://www.ncbi.nlm.nih.gov/pubmed/27504074
http://dx.doi.org/10.1107/S1600576716007135
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