Retentivity

From Wikipedia, the free encyclopedia

The retentivity of a material is its capacity to remain magnetized after the external magnetizing field has ceased to exist.

A material with high retentivity (i.e. iron) will keep some magnetic properties, it will become a permanent magnet.
A material with low or no retentivity will not keep the magnetic properties, it will lose its magnetization.

Things to add:

• Links to tables with retentivity of common materials.
• Retentivity curves.
• Explanation why retentivity occurs.