ferromagnetism is explain
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Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. In physics, several different types of magnetism are distinguished. ... The common ones are iron, nickel, cobalt and most of their alloys, and some compounds of rare earth metals.
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Spontaneous alignment of magnetic moments of domains in same direction....the ferro magnetic substances show permanent magnetism even after removal of field....Ex. CrO2
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