Question

define ferromagnetism
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Answer 1

having a high susceptibility to magnetization, the strength of which depends on that of the applied magnetizing field, and which may persist after removal of the applied field. This is the kind of magnetism displayed by iron, and is associated with parallel magnetic alignment of neighbouring atoms.

Answer 2

Ferromagnetism is the magnetic force that materials like iron, nickel, or cobalt show when they are in a magnetic field. Ferromagnetism is the ability of materials to be attracted to a magnet. Ferromagnetism is primarily caused by unpaired electron magnetic moments.