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Researchers enhanced elliptical planar Hall effect (EPHE) sensors to operate in larger magnetic fields while maintaining low noise. This expansion broadens their application potential in sensitive magnetic field detection.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Elliptical planar Hall effect (EPHE) sensors offer excellent equivalent magnetic noise (EMN) performance (pT/Hz).
  • Current EPHE sensors are limited to sub-milliTesla (mT) magnetic field ranges, restricting their practical applications.
  • Expanding the operational magnetic field range is crucial for wider sensor deployment.

Purpose of the Study:

  • To fabricate and characterize EPHE sensors with an enhanced magnetic field operating range.
  • To investigate the relationship between magnetic anisotropy and EMN in EPHE sensors.
  • To assess the potential of these enhanced sensors for various applications.

Main Methods:

  • Fabrication of EPHE sensors with tailored uniaxial shape-induced anisotropy.
  • Measurement of equivalent magnetic noise (EMN) at 10 Hz across varying magnetic anisotropy (12 Oe to 120 Oe).
  • Characterization of sensor behavior, including hysteresis and magnetic domain characteristics.

Main Results:

  • EPHE sensors were successfully fabricated with magnetic anisotropy ranging from 12 Oe to 120 Oe.
  • EMN at 10 Hz varied from 800 pT/Hz to 56 nT/Hz with increasing anisotropy.
  • The sensors demonstrated single magnetic domain behavior with negligible hysteresis.

Conclusions:

  • Increasing uniaxial shape-induced anisotropy effectively extends the operational magnetic field range of EPHE sensors.
  • EPHE sensors with enhanced field ranges show promise for applications requiring sensitive detection across a wider magnetic field spectrum.
  • These findings pave the way for developing more versatile magnetic sensors.