Ferrimagnetism/ferromagnetism arises due to unequal number of domains in oppsite direction resulting in net magnetic moment.

Explanation

### Step-by-Step Solution:

1. **Understanding the Concepts**:
- Ferrimagnetism and ferromagnetism are two types of magnetic ordering in materials. Both involve the alignment of magnetic domains, which are regions within a material where the magnetic moments of atoms are aligned in a particular direction.

2. **Ferrimagnetism**:
- In ferrimagnetic materials, there are unequal numbers of magnetic domains that align in opposite directions. This means that some domains point in one direction while others point in the opposite direction.
- Because of this unequal alignment, there is a net magnetic moment in the material. The magnetic moments that point in the same direction partially cancel out the moments that point in the opposite direction, leading to a net magnetic effect.
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