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Compact spherical neutron polarimeter using high-T(c) YBCO films.

T Wang1, S R Parnell1, W A Hamilton2

  • 1Center for Exploration of Energy and Matter, Indiana University Bloomington, Bloomington, Indiana 47408, USA.

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|April 3, 2016
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A new compact device enables precise spherical neutron polarimetry at small angles. This tool accurately characterizes magnetic fields in materials, advancing neutron scattering research.

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Area of Science:

  • * Condensed Matter Physics
  • * Materials Science
  • * Neutron Scattering Techniques

Background:

  • * Spherical neutron polarimetry is crucial for probing magnetic structures.
  • * Existing methods can be complex and limited in angular range.
  • * Controlled manipulation of neutron polarization is essential for advanced measurements.

Purpose of the Study:

  • * To introduce a simple, compact device for spherical neutron polarimetry.
  • * To enable measurements at small neutron scattering angles.
  • * To allow for controlled manipulation of neutron polarization directions.

Main Methods:

  • * Development of a device with a low magnetic field sample chamber.
  • * Integration of high-T(c) superconducting films and mu-metal for magnetic field isolation.
  • * Utilizing finite-element methods for magnetic field profile simulation and experimental verification.

Main Results:

  • * Successful prototype construction and testing in transmission geometry.
  • * Demonstrated ability to extract sample information and detect small angular variations in magnetic fields.
  • * Characterization of a Permalloy film in both zero and external magnetic fields.

Conclusions:

  • * The developed device is effective for spherical neutron polarimetry at small angles.
  • * It offers precise control over neutron polarization.
  • * The device shows promise for detailed magnetic characterization of materials.