Abstract
Differential thermal analyses (DTA) by heating and cooling are carried out for some ferromagnetic (Fe-5 at%Cr), ferrimagnetic (Fe 3 O 4 , NiFe 2 O 4 , Li 0.5 Fe 2.5 O 4 , BaO·6Fe 2 O 3 , SrO·5.6Fe 2 O 3 ) and antiferromagnetic (NiO) materials respectively. Though each specimen has a sharp λ-type peak at the magnetic transition point T C or T N on the heating DTA curve, a λ-type peak with a rounded top is observed for each specimen at temperatures a little below the transition point on cooling. It can be interpreted that the nucleation and growth of the magnetic domain in a non-magnetic matrix starts from T C or T N on cooling.
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