What is curie temperature?

Explanation

### Step-by-Step Solution:

1. **Definition of Curie Temperature**:
The Curie temperature (denoted as Tc) is defined as the temperature above which a ferromagnetic material loses its ferromagnetic properties and behaves like a paramagnetic material.

2. **Understanding Ferromagnetism and Paramagnetism**:
- **Ferromagnetic Materials**: These materials have a strong magnetic ordering and exhibit permanent magnetism. They have a net magnetic moment even in the absence of an external magnetic field.
- **Paramagnetic Materials**: These materials have a weak and temporary magnetic response. They do not retain magnetism in the absence of an external magnetic field.
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