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When the temperature of a ferromagnetic or ferrimagnetic material is increased, the added
thermal energy increases the mobility of the domains, making it easier for them to become
aligned, but also preventing them from remaining aligned when the field is removed.
Consequently, saturation magnetization, remanance, and the coercive field are all reduced
at high temperatures.
If the temperature exceeds the Curie temperature (Tc), ferromagnetic or ferrimagnetic behavior is no longer observed. Instead, the material behaves as a paramagnetic material. The Curie temperature which depends on the material, can be changed by alloying elements. French scientists Marie and Pierre Curie (the only husband and wife to win a Nobel prize; Marie Curie actually won two
Nobel prizes) performed research on magnets, and the Curie temperature refers to their
name. The dipoles still can be aligned in a magnetic field above the Curie temperature,
but they become randomly aligned when the field is removed.
Figure and Table taken from :The Science and Engineering of Materials by Donald R. Askeland, Pradeep P. Fulay, Wendelin J. Wright (Very good Book)
When the temperature of a ferromagnetic or ferrimagnetic material is increased, the added
thermal energy increases the mobility of the domains, making it easier for them to become
aligned, but also preventing them from remaining aligned when the field is removed.
Consequently, saturation magnetization, remanance, and the coercive field are all reduced
at high temperatures.
If the temperature exceeds the Curie temperature (Tc), ferromagnetic or ferrimagnetic behavior is no longer observed. Instead, the material behaves as a paramagnetic material. The Curie temperature which depends on the material, can be changed by alloying elements. French scientists Marie and Pierre Curie (the only husband and wife to win a Nobel prize; Marie Curie actually won two
Nobel prizes) performed research on magnets, and the Curie temperature refers to their
name. The dipoles still can be aligned in a magnetic field above the Curie temperature,
but they become randomly aligned when the field is removed.
Figure and Table taken from :The Science and Engineering of Materials by Donald R. Askeland, Pradeep P. Fulay, Wendelin J. Wright (Very good Book)
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