Ferromagnetism is the characteristic of substances such as iron, nickel, or cobalt and various alloys that demonstrate particularly high magnetic permeability, a characteristic saturation point, and magnetic hysteresis. Ferromagnetic materials, such as iron, contain unpaired electrons, each with a small magnetic field of its own, that align readily with each other in response to an external magnetic field. In short, it can be said that those materials when placed in a magnetic field acquire strong magnetism in the direction of the magnetizing field are called ferromagnetic materials. Examples – Iron, nickel, cobalt etc.
- They are strongly attracted by magnets.
- They are solids and crystalline.
- They possess magnetic retentively.
- They have fixed curie points.
- Magnetic susceptibility is positive and has high value.
- They have hysteresis properties.
- Their permeability s of a high order, μ ˃ 1.
- Their susceptibility depends on temperature, i.e., K ∞ 1/T.
- Some magnetism remains after the removal of the magnetic field.
- They tend to go quickly to the stronger region at the field from the weaker region.