A magneto-optical microscope for quantitative measurement of magnetic microstructures

Area of Science:

• Magnetism
• Optics
• Microscopy

Background:

• Accurate characterization of microscale magnetic fields is crucial for developing advanced magnetic devices.
• Existing methods often lack the required spatial or field resolution for microscale applications.

Purpose of the Study:

• To develop and validate a novel optical system for quantitative mapping of stray magnetic fields.
• To achieve high spatial and field resolution for microscale magnetic structures.

Main Methods:

• Utilized a magneto-optical indicator film (MOIF) with an upright reflective polarizing light microscope.
• Employed a single light path construction and discrete multi-image polarimetry for data extraction.
• Developed integrated equipment, image analysis software, and experimental protocols.

Main Results:

• Achieved quantitative mapping of magnetic fields perpendicular to the image plane.
• Demonstrated field resolution down to 50 μT and spatial resolution down to 4 μm.
• Successfully calibrated MOIFs for different magnetic field ranges and validated the system with calibration samples.

Conclusions:

• The presented optical system offers a powerful tool for precise microscale magnetic field analysis.
• The novel methodology enables quantitative areal field measurements with high resolution.
• This system has significant potential for research and development in micro-magnetics.