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In an antiferromagnetic material the neighbouring atomic moments are

  • A.antiparallel and of equal magnitude, giving no net moment
  • B.antiparallel and of unequal magnitude, giving a net moment
  • C.parallel, as in a ferromagnetic material
  • D.randomly oriented at all temperatures

Answer: A

Exact cancellation leaves the material with almost no external magnetisation despite the strong internal ordering. Where the opposed moments are unequal the cancellation is incomplete and the material is ferrimagnetic, which is what a ferrite is.

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