Domains

Definition

Domains are small, magnetically uniform regions within a ferromagnetic material. Each domain has its own magnetic moment that can align with an external magnetic field.

5 Must Know Facts For Your Next Test

1. Domains are the basic units of magnetization in ferromagnetic materials.
2. In the absence of an external magnetic field, domains are randomly oriented, resulting in no net magnetization.
3. When exposed to an external magnetic field, domains align in the direction of the field, increasing the material's overall magnetization.
4. The process of domain alignment and growth continues until saturation magnetization is achieved.
5. Domain walls separate different domains and their movement is crucial for the material's magnetic properties.

Review Questions

• What happens to the orientation of domains in a ferromagnetic material when it is not exposed to an external magnetic field?
• How do domains contribute to the overall magnetization of a ferromagnetic material when an external magnetic field is applied?
• What role do domain walls play in the magnetic properties of a material?

Related terms

Ferromagnetism:

A phenomenon where certain materials exhibit spontaneous magnetization; they can become strongly magnetized under an external magnetic field.

Domain Wall: The boundary separating different magnetic domains within a ferromagnetic material.

Saturation Magnetization: The maximum extent to which a ferromagnetic material can be magnetized, achieved when all domains are fully aligned with the external magnetic field.