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Why curie temperature is only applied for ferromagnetic material ? Why not for diamagnetic and paramagnetic substances ?

Why curie temperature is only applied for ferromagnetic material ?
Why not for diamagnetic and paramagnetic substances ?

Grade:12

1 Answers

jyoti bhatia
202 Points
5 years ago

CURIE temperature is related with magnetism and is named after Pierre Curie( Marie Curie’s husband). It is the temperature at which certain materials will lose its magnetic property. Now magnetic property of a material depends on orientation of Dipoles/ Magnetic moments which in return depends on angular momentum of electron and its spin.  Have a look at different configurations of magnetic dipoles…

  • Ferromagnetism: The magnetic moments in a ferromagnetic material is shown below. The moments are ordered and of the same magnitude in the absence of an applied magnetic field.
  • Paramagnetism:
  •  The moments are disordered in the absence of an applied magnetic field and ordered in the presence of an applied magnetic field.
  • Ferrimagnetism:
  • The magnetic moments in a ferrimagnetic material is shown below. The moments are aligned oppositely and have different magnitudes due to being made up of two different ions. This is in the absence of an applied magnetic field. Antiferromagnetism: 
  • The magnetic moments in an antiferromagnetic material. The moments are aligned oppositely and have the same magnitudes. This is in the absence of an applied magnetic field.

    The materials are only magnetic below curie temperature above which it loses this property. This means that by increasing the temperature the orientation of the magnetic moments changes due to which the ferro-magnetic materials loses its magnetic property and change to para-magnetic property. And that’s the reason why CURIE Temperature is also defined as “ The temperature at which ferro-magnetism changes to para-magnetism” . That means the magnetic dipoles are oriented in random fashion because of which the net effect of magnetic property becomes nill.

    The Curie temperature of different materials is different. For example Curie temperature of iron is 1043K (770 °C). And the curie temperature point of materials can be also change by following.

  • Composite materials
  • Pressure
  • Orbital orientation.
  • The curie temperature depends on the orientation of magnetic dipoles which is indeed dependent on angular momentum and spin of electrons. So, in case of ferromagnetic materials in which the magnetic moments are aligned in perfect order changes its order to become para-magnetic with random orientation of dipoles it is said to be Curie point and that temperature is called Curie temperature.
     

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