Ferromagnetic material shows strong para-magnetic behaviour due to the formation of domains. These domains belong to:

Ferromagnetic material shows strong para-magnetic behaviour due to the formation of domains. These domains belong to: Correct Answer Interfacial defects

In ferromagnetic materials, the alignment of magnetic dipoles vary across domain walls. These walls spread across large surfaces but have negligible thickness.

Related Questions

Assertion (A) The ferromagnetic substances do not obey Curie's law.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
 When does a ferromagnetic material become a paramagnetic material?
At what temperature, a ferromagnetic material becomes paramagnetic material?