Remanence

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A family of hysteresis loops for grain-oriented electrical steel (B_R denotes remanence and H_C is the coercivity.

Remanence is the magnetization left behind in a medium after an external magnetic field is removed. It is denoted in equations as M_r. In engineering applications it is often assumed that the magnetization M is synonymous with the flux density B, hence the remanence is denoted as B_R (see the image).

The remanence magnitude can be taken from a hysteresis loop at the intersections of the loop with the vertical magnetization axis.

Remanence has application in:

• geology (concerning paleomagnetism)
• computer engineering (concerning data storage and recovery, see data remanence)
• physics (concerning magnetism).

The value of remanence is one of the most important parameters characterising permanent magnets.

[edit] External links

• Coercivity and Remanence in Permanent Magnets

[edit] See also

• retentivity
• Coercivity
• hysteresis

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