Antiferromagnetic property is given as

Options

A. `uarr uarr uarr uarr`
B. `uarr uarr darr uarr`
C. `uarr darr uarr darr`
D. `darr darr darr darr`

Answer

To determine which arrangement represents the antiferromagnetic property, we need to understand the concept of antiferromagnetism and analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding Antiferromagnetism**:
- Antiferromagnetism is a type of magnetic ordering in solids where adjacent ions (or atoms) behave like tiny magnets and align themselves in an anti-parallel manner. This means that the magnetic moments of adjacent ions point in opposite directions.
- As a result of this anti-parallel alignment, the material exhibits no net macroscopic magnetism.

2. **Analyzing the Options**:
- We have four arrangements of tiny magnets to analyze.

3. **Option 1**:
- All tiny magnets are aligned in the same direction (parallel).
- Since they are all parallel, there is no cancellation of magnetism. This arrangement does not represent antiferromagnetism.

4. **Option 2**:
- Three magnets are parallel, and one is anti-parallel to them.
- In this case, there is still a net magnetic moment due to the three parallel magnets. Therefore, this arrangement does not represent antiferromagnetism.

5. **Option 3**:
- The arrangement shows alternating magnets: parallel, anti-parallel, parallel, anti-parallel.
- Here, adjacent magnets are aligned in opposite directions (anti-parallel). This results in cancellation of the magnetic moments, leading to no net external magnetism. This arrangement represents antiferromagnetism.

6. **Option 4**:
- All magnets are aligned in the same direction (parallel).
- Similar to Option 1, this arrangement does not allow for cancellation of magnetism and does not represent antiferromagnetism.

7. **Conclusion**:
- The only arrangement that represents the antiferromagnetic property is **Option 3**.

### Final Answer:
The antiferromagnetic property is represented by **Option 3**.