|
|
Glossary - D |
Demagnetization curve
Demagnetisation factor
Demagnetisation
Demagnetization field
Diamagnetic material
Differential permeability µd
Demagnetization curve
The portion of the hysteresis loop in the second quadrant. This diagram gives the most important information about a permanent magnet: Br, HcB, HcJ, BHmax, working point, etc.
^ top ^
Demagnetisation factor
In a magnetized magnet exists an internal demagnetization field Hd produced by the poles of the magnet itself. This field has opposite direction respect the magnetization M and it is related to it by the relationship Hd = N×M, where N is the demagnetization factor.
^ top ^
Demagnetisation
Reduction of magnetisation by different means: an opposed field, an alternating and decreasing field or an increasing of the temperature (above the Curie temperature).
^ top ^
Demagnetization field
A magnetizing force applied in such a direction as to reduce the remaining induction in a magnetized body.
^ top ^
Diamagnetic material
A material having permeability less than permeability of vacuum µ0 (and a negative susceptibility).
^ top ^
Differential permeability µd
It is defined as the slope of the normal induction curve:
1 dB
µd = ____ . ____
µ0 dH
^ top ^
|
|
Sitemap
