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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electromagnetism

Background:

  • Magnetic components are integral to energy conversion devices like electric generators and motors.
  • Toroidal inductors, common in daily electric devices, utilize magnetic ring cores.
  • The behavior of the magnetization vector (M) within these cores has been theorized but not directly verified.

Purpose of the Study:

  • To directly verify the distribution and circulation of the magnetization vector (M) within a magnetic core of an inductor.
  • To develop and apply a method for multiscale operando imaging of magnetic states in functional devices.

Main Methods:

  • Measurement of polarized neutron transmission spectra.
  • Utilized a ferrite ring core assembled on a standard inductor device.
  • Operando imaging technique to observe magnetic states under power supply.

Main Results:

  • Directly mapped the distribution of the magnetization vector (M) within the ferrite ring core.
  • Confirmed that M circulates within the core with a ferrimagnetic spin order when the inductor is powered.

Conclusions:

  • The study provides the first direct experimental verification of the circulating magnetization vector in an inductor's magnetic core.
  • The developed neutron transmission technique enables operando imaging of complex magnetic states.
  • This method can be used to evaluate novel architectures for high-performance energy conversion systems.