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What are the most significant properties of permanent magnetic materials? Explain.
Ans:
The most significant properties of permanent magnetic materials are
(i) Remanence (Residual magnetism (Br) :
It is the intensity of the residual magnetism after magnetism field(H) has been removed.
(ii) Coercive force (Hc):
It is the resistance of magnetic material to demagnetization by electromagnetic techniques.
(iii) Energy product value (BH) max:
It is a measure of the amount of magnetic energy stored a magnet after magnetising field is removed.
Requirement of permanent magnetic material is that product of B and H should be maximum possible and it takes place when product of CD and DE on demagnetising curve is at a maximum. Depending upon requirement of remanence and coercive force, permanent magnetic material is selected.
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