Hexapod Hall scanner for high-resolution large area magnetic imaging.

Area of Science:

• Instrumentation and Measurement
• Materials Science
• Applied Physics

Background:

• Accurate magnetic field mapping requires precise control over sensor positioning and orientation.
• Planar sensors like Hall devices are sensitive to their distance and tilt relative to the sample surface.
• Existing scanning systems may lack the dexterity for optimal sensor alignment.

Purpose of the Study:

• To develop and demonstrate a six-axis scanning imaging apparatus with a large scan range.
• To enable in situ correction of probe tilt angle for minimizing sensor-to-sample distance.
• To improve the quality of magnetic imaging data acquired by planar sensors.

Main Methods:

• Utilizing piezo bending actuators for six degrees of freedom motion control.
• Integrating a coupling mechanism with a translation stage for comprehensive scanning.
• Employing an indium antimonide (InSb) Hall sensor and a magnetic sample for data acquisition.
• Implementing a synchronous commutation setup to reduce Hall signal offset.

Main Results:

• The six-axis apparatus provides complete control over sensor position and orientation.
• In situ probe tilt correction minimizes the sensor distance to the sample surface.
• Alignment optimization significantly impacts the quality of measured magnetic data.
• Synchronous commutation effectively reduces Hall signal offset, enhancing image clarity.

Conclusions:

• The demonstrated six-axis scanning imaging apparatus offers superior control for high-resolution magnetic imaging.
• In situ alignment capabilities are crucial for maximizing data quality with planar sensors.
• The synchronous commutation technique provides a significant enhancement for magnetic imaging applications.