How It Works

Samples can be in the form of wafers or thin films. In the standard van der Paue configuration, for a sample of typically 1 cm in size 4 point contacts at the corner are created. It is very important to make the ohmic contacts. For the hall measurement, a magnetic field is applied perpendicular to the sample, a DC current is passed through the crossing contacts and the hall voltage is read across the two other contacts. For sheet resistance, the current passes through adjacent contacts and voltage is measured at two other contacts. HSR-24AC automatically changes the magnetic field direction (through AC field), and measures 6 different input-output configurations to remove DC offsets and other sources of error, to calculates the right values of hall voltage and resistivity