History of the Hall Effect
Posted: Mon Feb 10, 2025 8:43 am
When deriving the formula for U, we assumed that all charge carriers have the same speed. If we take into account the distribution of charge carriers by speed, then it is necessary to introduce a numerical factor A that is different from one:
where A is a constant depending on the mechanism of scattering of charge carriers: A = 1.93 … 0.99. For almost most metals, A≈1 can be considered.
When electrons are scattered by thermal vibrations of the lattice:
Where do we get:
The Hall effect principle was named after the American physicist Edwin Hall (1855–1938). It was first introduced to the world in 1879.
In 1879, he discovered that when a current-carrying conductor/semiconductor is placed perpendicular to a magnetic field, a voltage is generated that can be measured at right angles to the portugal mobile database path. During this time, electric current in a wire was thought to be somewhat similar to flowing liquid in a pipe.
The principle of the Hall effect suggests that the magnetic force in a current causes crowding at the end of a pipe or (wire). The electromagnetic principle now explains the science behind the Hall effect much better. The theory of this Hall was certainly far ahead of its time. It was not until two decades later, with the introduction of semiconductors, that the work and use of the Hall effect was effectively utilized.
Initially, this principle was used to classify chemical samples. Later, Hall sensors (using indium arsenide semiconductor compounds) became a source for measuring a constant or static magnetic field without keeping the sensor in motion. After a decade in the 1960s, silicon semiconductors emerged. This was the time when Hall elements were combined with built-in amplifiers, and thus the Hall switch was introduced to the world.
where A is a constant depending on the mechanism of scattering of charge carriers: A = 1.93 … 0.99. For almost most metals, A≈1 can be considered.
When electrons are scattered by thermal vibrations of the lattice:
Where do we get:
The Hall effect principle was named after the American physicist Edwin Hall (1855–1938). It was first introduced to the world in 1879.
In 1879, he discovered that when a current-carrying conductor/semiconductor is placed perpendicular to a magnetic field, a voltage is generated that can be measured at right angles to the portugal mobile database path. During this time, electric current in a wire was thought to be somewhat similar to flowing liquid in a pipe.
The principle of the Hall effect suggests that the magnetic force in a current causes crowding at the end of a pipe or (wire). The electromagnetic principle now explains the science behind the Hall effect much better. The theory of this Hall was certainly far ahead of its time. It was not until two decades later, with the introduction of semiconductors, that the work and use of the Hall effect was effectively utilized.
Initially, this principle was used to classify chemical samples. Later, Hall sensors (using indium arsenide semiconductor compounds) became a source for measuring a constant or static magnetic field without keeping the sensor in motion. After a decade in the 1960s, silicon semiconductors emerged. This was the time when Hall elements were combined with built-in amplifiers, and thus the Hall switch was introduced to the world.