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:
-
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- 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. doi: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 = {Thu Jun 09 00:00:00 EDT 2016},
month = {Thu Jun 09 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
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