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  • Explain the following with suitable examples (i) Ferromagnetism

1.26     Explain the following with suitable examples:

                    (i) Ferromagnetism

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(i) Ferromagnetism

Substances that are attracted very strongly by a magnetic field are called ferromagnetic substances. Examples: iron, cobalt, nickel, gadolinium, and CrO2. Besides strong attractions, these substances can be permanently magnetized. The metal ions of ferromagnetic substances are grouped together into small regions called domains. Thus, each domain acts as a tiny magnet. In an unmagnetized piece of a ferromagnetic substance, the domains are randomly oriented and their magnetic moments get canceled. When the substance is placed in a magnetic field all the domains get oriented in the direction of the magnetic field as shown in the figure and a strong magnetic effect is produced. This ordering of domains persists even when the magnetic field is removed and the ferromagnetic substance becomes a permanent magnet.

The figure is as shown :

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seema garhwal

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