An unmagnetised piece of a ferromagnetic material may contain many strongly magnetised microscopic domains, yet its net magnetic moment can be nearly zero because:
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Question

An unmagnetised piece of a ferromagnetic material may contain many strongly magnetised microscopic domains, yet its net magnetic moment can be nearly zero because:

G1 Physics · Accepted Answer

Within an individual ferromagnetic domain, many atomic magnetic moments are strongly aligned, so each domain can have a large magnetisation. However, in an unmagnetised macroscopic specimen, different domains point in different directions. Their vector sum can therefore be approximately zero. Hence the specimen can have nearly zero net magnetic moment despite strongly magnetised domains.