Wiegand effect

[1] Wiegand wire is low-carbon Vicalloy, a ferromagnetic alloy of cobalt, iron, and vanadium.

The value of the Wiegand effect is that the switchover speed is sufficiently fast that a significant voltage can be output from a coil using a Wiegand-wire core.

This higher voltage can easily be detected electronically, and when combined with the high repeatability threshold of the magnetic field switching, making the Wiegand effect useful for positional sensors.

[2] The consistency of the pulses produced by Wiegand sensors can be used to provide energy for low-power and energy-saving applications.

The card is read by pulling it through a slot in a reader device, which has a fixed magnetic field and a sensor coil.

The resulting Wiegand protocol digital code is then sent to a host controller to determine whether to electrically unlock the door.

[10][11] Wiegand wires are fitted to the outer diameter of a wheel to measure rotational speeds.