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Lake Shore launches 7-inch magnet Hall measurement system

The new AC/DC version of the system can characterise III-V materials with a mobiility range from 1 to 0.001 V
The new Model 8407 Hall effect measurement system from Lake Shore Cryotronics features a 7-inch magnet for measuring mobilities at the low end of the DC field measurement range, from 1 to 106 cm2/V s.

The Hall effect is the production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current.

When a current-carrying semiconductor is kept in a magnetic field, the charge carriers of the semiconductor experience a force in a direction perpendicular to both the magnetic field and the current. At equilibrium, a voltage appears at the semiconductor edges.

Like Lake Shore’s existing Model 8404 with 4-inch magnet, the 8407 system can be ordered with AC field measurement capabilities. With AC field measurement added, the system is capable of measuring materials with extremely low mobilities (down to 10-3/ V s).

Model 8407 Hall measurement system

These can include photovoltaic (solar cell), thermoelectric and organic electronic materials, which have electronic properties that can be difficult to measure with DC field Hall methods.

Software included with the system enables both van der Pauw and Hall bar measurements. It is capable of measuring samples with gated Hall bars to account for gate bias, setting up loops with varying temperatures and gate voltages, performing time loops of measurements for longer unattended operation, and more.

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