British Dictionary definitions for antiferromagnetism
antiferromagnetism
/ˌæntɪˌfɛrəʊˈmæɡnɪˌtɪzəm/
noun
1.
(physics) the phenomenon exhibited by substances that resemble paramagnetic substances in the value of their relative permeability but that behave like ferromagnetic substances when their temperature is varied See also ferrimagnetism