Dictionary:Weiss’s theory of magnetism

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{{#category_index:W|Weiss’s theory of magnetism}} (vīsz ∂z or wīsz ∂z) A ferromagnetic material is made up of small regions or domains magnetized to saturation (i.e., spins aligned cooperatively) despite the tendency of thermal agitation to disorient the spins (as in paramagnetism). A weak external field can orient the domains with the field direction, and, if strong enough, can align the domains irreversibly, making a permanent magnet. Named for Pierre Weiss (1865–1940), French physicist.