M91 FastHall™ Measurement Controller

M91 features

Simpler and more convenient

• All-in-one instrument
• Automatically selects optimal excitation and measurement levels
• Automatically executes measurement steps
• Provides complete Hall analysis
• Easy to use, easy to integrate with existing lab systems

Makes better measurements, faster

• No need to reverse the magnetic field with FastHall
• Up to 100× faster for low-mobility materials
• Improves accuracy by minimizing thermal drift

Cost-effective

• Build a new Hall system or upgrade an existing one
• Add state-of-the-art Hall measurement capability to any lab
• Use with any type of magnet

A new approach to Hall measurement

The MeasureReady® M91 is a revolutionary, all‑in-one Hall analysis instrument that delivers significantly higher levels of precision, speed, and convenience to researchers involved in the study of electronic materials.

Featuring Lake Shore’s patented FastHall measurement technique, the M91 fundamentally changes the way the Hall effect is measured by eliminating the need to switch the polarity of the applied magnetic field during the measurement. This breakthrough results in faster and more precise measurements, especially when using high-field superconducting magnets. Most commonly measured materials can be analyzed in a few seconds. Even extreme high-resistance (up to 200 GΩ) or low-mobility (~0.001 cm²/V s) samples can generally be analyzed in under 2 minutes. With other HMS techniques, this could take hours to complete.

A convenient, single instrument

Traditional Hall effect measurement systems (HMS) provide basic electrical measurement instrumentation combined with a switching unit to measure sample resistivity and Hall voltages but must rely on separate PC-based software to perform pre- and post-measurement calculations in order to ultimately derive the physical parameters that researchers need to know—resistivity, carrier type, carrier concentration, mobility, and Hall coefficient.

The M91 FastHall measurement controller combines all the necessary HMS functions into a single instrument, automating and optimizing the measurement process and directly reporting the calculated parameters. The included MeasureLINK-MCS application software enables you to easily initiate Hall measurement sequences and view graphical results, and measurement sequences can be readily customized and adapted to your research needs.

Key features of the instrument

• Hall analysis including calculation of derived parameters for van der Pauw and Hall bar samples
• FastHall technology eliminates the need for magnetic field reversal when measuring van der Pauw samples—extends mobility range down to 0.001 cm²/V s
• Traditional DC field Hall measurement mode for both Hall bar and van der Pauw samples
• Automated operation for maximum convenience—includes automatic optimization of excitation values and measurement range
• Manual step-by-step mode for full parameter control
• High-resistance option—enables measurement of samples to 200 GΩ
• Outputs all measured values plus derived parameters
• 1-year calibration

For more information about the M91 controller and options, as well as specifications, charts, videos, and other details, visit the M91 page on the Lake Shore website.

Also available: a tabletop system containing the M91

With the FastHall Station, the M91 controller is provided as part of an integrated, high-precision tabletop system that includes a Windows® 10 PC, 1 T permanent magnet, high-precision sample holder, and all the necessary software and cabling to provide a range of measurement capabilities. Plus, it can also be ordered with an LN₂ option for converting the station into a cryogenically cooled sample space.