Hall Effect Measurement System - 9700 Superconducting Magnet Series from Lake Shore Cryotronics

Lake Shore Hall Effect Measurement (HMS) systems combine a wide resistance range, high voltage capability, high magnetic field, and broad temperature range to provide the most capable electronic transport measurement systems available today. The HMS systems feature hardware with electromagnet and superconducting magnet based platforms that can measure samples with resistances ranging from 10 µ ohms to 200 G ohm, provide fields to 9 tesla, temperatures from 2K to 800K, accommodate samples up to 6” in diameter, or measure up to 4 consecutive samples without a hardware change. Software features include experiment profiles with multiple measurement steps and samples, complete details of every voltage measurement, predefined measurement sequences, offline data viewing, contact formation, and depletion layer corrections.

The HMS measurement capabilities include Hall coefficient, Hall voltage, resistance, resistivity, magnetoresistance, I-V curves, carrier concentration and mobility. The HMS measures most compound semiconductor materials including pHEMTS, SiGe, SiC, InAs, InGaAs, InP, AlGaAs, HgCdTe, and ferrites; low resistance materials including metals, transparent oxides, dilute magnetic semiconductors, and TMR materials; and high resistance materials including semi-insulating GaAs and GaN, CdTe, and photodetectors.

Quantitative Mobility Spectrum Analysis (QMSA) software technique analyzes variable magnetic field Hall data to resolve individual carrier mobilities and densities in multi-carrier devices. The QMSA software’s reliability and sensitivity make it the ideal technique for routine characterization of various multi-carrier materials and high mobility heterostructure devices. QMSA also has several advantages over previous conduction analysis techniques in that QMSA is fully automated, it does not require advance sample information, and it simultaneously provides individual carrier density and mobility (not an average over all the carriers).

Features of the 7600 Series

Features of the 9700 Series Superconducting Magnet Hall Effect Measurement Systems include:

  • Standard sample resistance ranges from 0.04 m.ohm to 200 G.ohm
  • Fields to 9 T
  • Temperatures from 2 K to 400 K
  • Quantitative Mobility Spectrum Analysis (QMSA®) software resolves individual carrier mobilities and densities in multi-carrier devices
  • Anomalous Hall Effect measurements for spintronics including dilute magnetic semiconductors and ferromagnetic metallic alloys
  • AC current option measures resistance down to 10 µ.ohm and increases resolution up to 10 ppm from 0.1 ohm to 10 k.ohm

Backed and supported by nearly two decades of expertise in materials characterization systems, Lake Shore’s fully integrated Hall effect measurement systems (HMS) are used to characterize physical properties in semiconductors, as well as other electronic materials including magnetoresistors, multilayer magnetic films, dilute magnetic semiconductors, superconductors, and spintronics devices. Available in a variety of electromagnet-based configurations ranging in field up to 2 T or a powerful 9 T superconducting magnet-based configuration, Lake Shore HMS are ideally suited for the most demanding materials research applications, product development, and quality control. An assortment of options expands the functionality of Lake Shore HMS.

Modern materials ranging from compound semiconductors to nanomaterials are pushing the limits of transport measurements. Lake Shore combines precision electronics, flexible software, variable magnetic field and temperature, and a wide resistance range into the most advanced HMS. When used in combination with data taken from the variable field Hall measurement, our proprietary Quantitative Mobility Spectrum Analysis (QMSA®) software resolves individual carrier mobilities and densities in multi-carrier devices such as quantum wells and high electron mobility transistors (HEMTs).

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