Curie Temperature

A characteristic property of ferromagnets, as well as piezoelectric materials.

Under a strong enough external magnetic field, the internal domains of the ferromagnet will align itself to the external field. Domain wall shifting may occur, such that remanence point is no longer zero.

However, thermal excitation of the system causes the atoms to vibrate...perfect alignment cannot be achieved at T > 0K, due to this thermal excitation. In fact, as temperature increases (T approaching Curie Temperature Tc), thermal energization will cause increasing fluxations, until all alignment is annihalated at Tc, leading the ferromagnet is act as a paramagnet, several factors weaker in magnetic amplification as the ferromagnet.

ECE209: Properties of Electrical Materials (Exam on Wednesday)