Classification of solids based on response to magnetic field:
| Substance |
Characteristics |
Magnetic alignment |
Examples |
| Diamagnetic materials |
- Repelled weakly in magnetic field.
- All electrons are paired.
|
 |
Benzene, NaCl, water, etc. |
| Paramagnetic materials |
- Weakly attracted in magnetic field.
- Unpaired electrons are present.
- Permanent magnetisation is not possible.
|
 |
O2, Cu2+, Fe3+, Cr3+, etc. |
| Ferromagnetic materials |
- Strongly attracted in magnetic field.
- Unpaired electrons are present.
- Permanent magnetisation is possible.
- Above the Curie temperature, ferromagnetic substance changes to paramagnetic substance.
|
 |
Fe, Ni, Co, CrO2, etc. |
