Development and application of setup for ac magnetic field in neutron scattering experiments

Area of Science:

• Materials Science
• Condensed Matter Physics
• Magnetism

Background:

• Neutron scattering is a powerful technique for probing material properties.
• Studying dynamic magnetic processes requires controlled time-varying magnetic fields.
• Existing setups may lack the flexibility for wide-ranging AC field generation.

Purpose of the Study:

• To develop and characterize a novel setup for generating homogeneous AC magnetic fields.
• To demonstrate the utility of this setup in advanced neutron scattering experiments.
• To establish AC polarized neutron reflectometry (PNR) for probing magnetic remagnetization.

Main Methods:

• Assembly of an RF generator, amplifier, wide-band transformer, and resonance circuit.
• Generation of homogeneous AC magnetic fields in a few cm³ volume.
• Application in AC polarized neutron reflectometry (PNR) experiments on soft ferromagnetic films.

Main Results:

• The setup successfully generates AC magnetic fields with variable amplitude and frequency.
• AC PNR experiments on iron films showed significant sensitivity to the applied AC field.
• The generated field parameters align well with the scales of remagnetization processes.

Conclusions:

• The developed RF setup is effective for AC magnetic field generation in neutron scattering.
• AC PNR is a viable method for investigating dynamic magnetic behaviors in materials.
• The technology holds potential for broader applications in condensed matter research.