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Title: Imaging of dynamic magnetic fields with spin-polarized neutron beams

Abstract

Precession of neutron spin in a magnetic field can be used for mapping of a magnetic field distribution, as demonstrated previously for static magnetic fields at neutron beamline facilities. The fringing in the observed neutron images depends on both the magnetic field strength and the neutron energy. In this paper we demonstrate the feasibility of imaging periodic dynamic magnetic fields using a spin-polarized cold neutron beam. Our position-sensitive neutron counting detector, providing with high precision both the arrival time and position for each detected neutron, enables simultaneous imaging of multiple phases of a periodic dynamic process with microsecond timing resolution. The magnetic fields produced by 5- and 15-loop solenoid coils of 1 cm diameter, are imaged in our experiments with ~100 μm resolution for both dc and 3 kHz ac currents. Our measurements agree well with theoretical predictions of fringe patterns formed by neutron spin precession. We also discuss the wavelength dependence and magnetic field quantification options using a pulsed neutron beamline. Furthermore, the ability to remotely map dynamic magnetic fields combined with the unique capability of neutrons to penetrate various materials (e.g., metals), enables studies of fast periodically changing magnetic processes, such as formation of magnetic domains within metalsmore » due to the presence of ac magnetic fields.« less

Authors:
 [1];  [2];  [3];  [2];  [4];  [1];  [1];  [1];  [5]
+ Show Author Affiliations
  1. Univ. of California, Berkeley, CA (United States)
  2. Helmholtz-Zentrum Berlin, (Germany)
  3. European Spallation Source (ESS), Lund (Sweden); Univ. of Copenhagen (Denmark). The Niels Bohr Inst.
  4. Helmholtz-Zentrum Berlin, (Germany); University of Salford (United Kingdom)
  5. Nova Scientific, Inc Sturbridge, MA (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1452684
Grant/Contract Number:  
SC0009657
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 4; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; neutron imaging; magnetic fields; non-destructive testing

Citation Formats

Tremsin, A. S., Kardjilov, N., Strobl, M., Manke, I., Dawson, M., McPhate, J. B., Vallerga, J. V., Siegmund, O. H. W., and Feller, W. B. Imaging of dynamic magnetic fields with spin-polarized neutron beams. United States: N. p., 2015. Web. doi:10.1088/1367-2630/17/4/043047.
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Tremsin, A. S., Kardjilov, N., Strobl, M., Manke, I., Dawson, M., McPhate, J. B., Vallerga, J. V., Siegmund, O. H. W., & Feller, W. B. Imaging of dynamic magnetic fields with spin-polarized neutron beams. United States. https://doi.org/10.1088/1367-2630/17/4/043047
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Tremsin, A. S., Kardjilov, N., Strobl, M., Manke, I., Dawson, M., McPhate, J. B., Vallerga, J. V., Siegmund, O. H. W., and Feller, W. B. Wed . "Imaging of dynamic magnetic fields with spin-polarized neutron beams". United States. https://doi.org/10.1088/1367-2630/17/4/043047. https://www.osti.gov/servlets/purl/1452684.
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@article{osti_1452684,
title = {Imaging of dynamic magnetic fields with spin-polarized neutron beams},
author = {Tremsin, A. S. and Kardjilov, N. and Strobl, M. and Manke, I. and Dawson, M. and McPhate, J. B. and Vallerga, J. V. and Siegmund, O. H. W. and Feller, W. B.},
abstractNote = {Precession of neutron spin in a magnetic field can be used for mapping of a magnetic field distribution, as demonstrated previously for static magnetic fields at neutron beamline facilities. The fringing in the observed neutron images depends on both the magnetic field strength and the neutron energy. In this paper we demonstrate the feasibility of imaging periodic dynamic magnetic fields using a spin-polarized cold neutron beam. Our position-sensitive neutron counting detector, providing with high precision both the arrival time and position for each detected neutron, enables simultaneous imaging of multiple phases of a periodic dynamic process with microsecond timing resolution. The magnetic fields produced by 5- and 15-loop solenoid coils of 1 cm diameter, are imaged in our experiments with ~100 μm resolution for both dc and 3 kHz ac currents. Our measurements agree well with theoretical predictions of fringe patterns formed by neutron spin precession. We also discuss the wavelength dependence and magnetic field quantification options using a pulsed neutron beamline. Furthermore, the ability to remotely map dynamic magnetic fields combined with the unique capability of neutrons to penetrate various materials (e.g., metals), enables studies of fast periodically changing magnetic processes, such as formation of magnetic domains within metals due to the presence of ac magnetic fields.},
doi = {10.1088/1367-2630/17/4/043047},
journal = {New Journal of Physics},
number = 4,
volume = 17,
place = {United States},
year = {Wed Apr 22 00:00:00 EDT 2015},
month = {Wed Apr 22 00:00:00 EDT 2015}
}
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Publisher's Version of Record
https://doi.org/10.1088/1367-2630/17/4/043047
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