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Engineering Physics by S. Mani Naidu

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7.11 Soft and hard magnetic materials

During the process of magnetization, the domain wall moment takes place so that the favourably oriented domains increase in size and unfavourably oriented domains shrink.

Based on the resistance to the moment of domain walls by the applied magnetic field, the area inside the hysteresis loop and on some other properties, the magnetic materials are divided into soft and hard magnetic materials. Now, we shall discuss these materials separately.

(a) Soft magnetic materials

The resistance to the moment of domain walls is less and it is easy to magnetize. The soft magnetic materials are characterized by: (i) low remanent magnetization, (ii) low coercivity, (iii) low hysteresis losses, (iv) high magnetic permeability ...

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