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What element is used to make permanent magnets?
Dec 21, 2018

What element is used to make permanent magnets?

A few substances like iron,cobalt, nickel, gadolinium and CrO2 are attracted very strongly by a magnetic field. Such substances are called ferromagnetic substances. Besides strong attractions , these substances can be permanently magnetised. In solid state,the metal ions of ferromagnetic substances are grouped together into small regions called domains. Thus , each domains acts as a tiny magnet. In an unmagnetised piece of a ferromagnetic substance the domains are randomly oriented and their magnetic moments get cancelled. When the substance is placed in a magnetic field all domains get oriented in direction of the magnetic field and a strong magnetic effect is produced. This ordering of domains persist even when the magnetic field is removed and the ferromagnetic substance becomes a permanent magnet.


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