Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond curie temperature, then it will show

Options

A. anti ferromagnetism
B. no magnetic property
C. diamagnetism
D. paramagnetism

Explanation

To solve the question regarding the magnetic properties of nickel when the temperature is increased beyond its Curie temperature, we can follow these steps:

### Step 1: Understand Ferromagnetism
Nickel is a ferromagnetic material at room temperature, which means it has a strong magnetic property due to the alignment of magnetic moments of its atoms. This alignment is maintained by a phenomenon known as exchange coupling.

**Hint:** Recall that ferromagnetic materials exhibit spontaneous magnetization due to aligned magnetic moments.

### Step 2: Define Curie Temperature
The Curie temperature is the critical temperature above which a ferromagnetic material loses its ferromagnetic properties and transitions to a different magnetic state. For nickel, this temperature is a specific value above which the material no longer exhibits ferromagnetism.

**Hint:** Remember that the Curie temperature is the threshold for the transition from ferromagnetism to another magnetic state.

### Step 3: Effects of Temperature Increase
When the temperature of a ferromagnetic material like nickel is increased beyond the Curie temperature, the thermal energy becomes sufficient to disrupt the alignment of the magnetic moments. As a result, the material cannot maintain its ferromagnetic properties.

**Hint:** Consider how increased thermal energy affects the alignment of magnetic moments in a material.

### Step 4: Transition to Paramagnetism
Once the temperature exceeds the Curie temperature, nickel transitions to a paramagnetic state. In this state, the magnetic moments are no longer aligned and can only respond to an external magnetic field, rather than exhibiting spontaneous magnetization.

**Hint:** Think about the characteristics of paramagnetic materials compared to ferromagnetic materials.

### Step 5: Conclusion
Thus, when the temperature of nickel is increased beyond its Curie temperature, it will exhibit paramagnetic properties.

**Final Answer:** Nickel shows paramagnetic properties when the temperature is increased beyond its Curie temperature.