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Scanning Magnetic Microscopy Using a High-Sensitivity Room-Temperature Tunnel Magnetoresistance Sensor for Geological

Hirokuni Oda1, Kosuke Fujiwara2, Naoto Fukuyo1,3

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This summary is machine-generated.

High-sensitivity tunnel magnetoresistance (TMR) devices enable advanced magnetic microscopy for geological samples. These room-temperature sensors offer superior performance compared to scanning SQUID microscopes for detailed magnetic imaging.

Keywords:
calibrationfrequency responsegeological thin sectionmagnetic point sourcescanning magnetic microscopysensor characteristicssuperconducting quantum interference device (SQUID)tunnel magnetoresistance (TMR) sensor

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Area of Science:

  • Geophysics
  • Materials Science
  • Microscopy

Background:

  • Magnetic microscopy is crucial for analyzing geological thin sections.
  • Room-temperature magnetic sensors offer potential advantages over cryogenic systems.
  • Tunnel magnetoresistance (TMR) devices exhibit high sensitivity for magnetic field detection.

Purpose of the Study:

  • To report on magnetic microscopy using high-sensitivity room-temperature TMR devices.
  • To evaluate TMR sensor performance for thin geological sections.
  • To compare TMR sensor results with scanning SQUID microscope (SSM) data.

Main Methods:

  • Utilized high-sensitivity room-temperature TMR devices for magnetic imaging.
  • Acquired magnetic images of a vertically magnetized basalt thin section.
  • Configured TMR sensors parallel to X and Y axes with varying lift-off distances.
  • Employed a magnetic point source for sensor evaluation and comparison with SSM.

Main Results:

  • TMR sensors provided detailed magnetic images of geological thin sections.
  • Observed slight discrepancies between TMR and SSM in high-spatial-resolution regions.
  • TMR sensor measurements showed significantly larger peak magnetic fields, magnetic moments, and dipole tilts compared to SSM.
  • Full Width at Half Maximum (FWHM) increased linearly with lift-off for both sensor types.

Conclusions:

  • High-sensitivity TMR devices are suitable for magnetic microscopy of geological samples.
  • TMR sensors demonstrate potential for enhanced magnetic characterization compared to SSM.
  • Discrepancies may stem from TMR sensor's vertical active region, noise, and drift.