Diamagnetic materials and their properties

1. The diamagnetism is the phenomenon by which the induced magnetic moment is always in the opposite direction of the applied magnetic field.


2. The magnetic material having negative susceptibility is called a diamagnetic material.

3. Further for the diamagnetic materials, each atom has no permanent magnetic moment.

4. The number of orientations of electronic orbits in an atom of the diamagnetic material is such that the vector sum of magnetic moment is zero. The external field will cause a rotation action on the individual electronic orbits. This produces an induced magnetic moment which is in the direction opposite to the field and hence tends to decrease the magnetic induction present in the specimen

5. Diamagnetic materials repel magnetic lines of force.

6. There are no permanent dipoles; consequently magnetic effects are very small

7. Generally the value of diamagnetic susceptibility is independent of temperature and applied magnetic field strength.

8. Generally the value of diamagnetic susceptibility is independent of temperature and applied magnetic field strength.



Eg:

Organic materials, light elements, Alkali earth, Bismuth, Niobium and its compounds in the super conducting state, etc

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