Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Remanence

Remanence or remanent magnetization is the magnetization left behind in a ferromagnetic material (such as iron) after an external magnetic field is removed. It is also the measure of that magnetization.[1] Colloquially, when a magnet is "magnetized" it has remanence.[2] The remanence of magnetic materials provides the magnetic memory inmagnetic storage devices, and is used as a source of information on the past Earth's magnetic field inpaleomagnetism.

The equivalent term residual magnetization is generally used in engineering applications. In transformerselectric motors and generators a large residual magnetization is not desirable (see also electrical steel) as it is an unwanted contamination, for example a magnetization remaining in an electromagnet after the current in the coil is turned off. Where it is unwanted, it can be removed by degaussing.

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