- The objective of this paper was to setup a simple automated system to measure the Hall effect in………… system at room temperature.
- The Hall effect Vн was observed when a magnetic field (B) was applied at right angles to a sample of material carrying an electronic current (I).
- Hall effect (or Hall voltage) that appears across the sample is due to an electric field which is it right angle to both the current and the applied magnetic field.
- Hall voltage can then be expressed as :…………………………. Where is the thickness of the sample , q is the charge and n is the charge carrier concentration.
- The quantity Rh = …………………….. is called the Hall coefficient.
- The Hall voltage is directly related to the magnetic field and the drift current , and it is inversely related to the thickness of the sample .
- A plot of Haa voltage (Vh) as a function of magnetic field (B) at constant current will have a slope given by …………………………………… .
- From (3) the slope of dependency Vh vs. B is defined , in particular , by the Hall coefficient Rh.
- This Rh carries information about majority electron or holes concentration.