Question:
Match List - I with List - II.
Choose the correct answer from the options given below :
Match List - I with List - II.
Choose the correct answer from the options given below :
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Associating elementary excitations with their names helps significantly: Phonon = Lattice vibration, Photon = Light/Electromagnetic wave, Magnon = Spin wave, Plasmon = Plasma oscillation.
Updated On: Aug 4, 2026
- A-III, B-IV, C-I, D-II
- A-I, B-II, C-III, D-IV
- A-II, B-III, C-IV, D-I
- A-III, B-I, C-IV, D-II
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The Correct Option is D
Solution and Explanation
Step 1: Concept:
This question tests fundamental definitions and phenomena related to magnetism and magnetic materials in solid-state physics.
Step 2: Step-by-step Explanation:
• A. Bloch wall: A Bloch wall is a transition region (boundary) between two adjacent magnetic domains in a ferromagnetic material where the magnetization gradually rotates from one direction to another.
Matches III (Separates domains magnetised in different directions).
• B. Anisotropy energy: Magnetic anisotropy is the directional dependence of a material's magnetic properties. The anisotropy energy is the energy required to deflect the magnetic moment from its preferred "easy axis" to a "hard axis". Thus, it directs magnetization along the easy axes.
Matches I (Directs the magnetisation along directions of easy magnetisation).
• C. Magnon: Just as a phonon is a quantized lattice vibration, a magnon is a quantized collective excitation of the electrons' spin structure in a crystal lattice (a spin wave).
Matches IV (Quantised spin wave).
• D. Curie Temperature ($T_c$): The critical temperature at which a ferromagnetic material loses its permanent magnetic properties and becomes paramagnetic. Above this temperature, its magnetic susceptibility follows the Curie-Weiss law.
Matches II (Above which the susceptibility of a ferromagnetic material obeys Curie-Weiss Law).
The complete matching sequence is A-III, B-I, C-IV, D-II.
Step 3: Final Answer:
The correctly matched sequence corresponds to option (D).
This question tests fundamental definitions and phenomena related to magnetism and magnetic materials in solid-state physics.
Step 2: Step-by-step Explanation:
• A. Bloch wall: A Bloch wall is a transition region (boundary) between two adjacent magnetic domains in a ferromagnetic material where the magnetization gradually rotates from one direction to another.
Matches III (Separates domains magnetised in different directions).
• B. Anisotropy energy: Magnetic anisotropy is the directional dependence of a material's magnetic properties. The anisotropy energy is the energy required to deflect the magnetic moment from its preferred "easy axis" to a "hard axis". Thus, it directs magnetization along the easy axes.
Matches I (Directs the magnetisation along directions of easy magnetisation).
• C. Magnon: Just as a phonon is a quantized lattice vibration, a magnon is a quantized collective excitation of the electrons' spin structure in a crystal lattice (a spin wave).
Matches IV (Quantised spin wave).
• D. Curie Temperature ($T_c$): The critical temperature at which a ferromagnetic material loses its permanent magnetic properties and becomes paramagnetic. Above this temperature, its magnetic susceptibility follows the Curie-Weiss law.
Matches II (Above which the susceptibility of a ferromagnetic material obeys Curie-Weiss Law).
The complete matching sequence is A-III, B-I, C-IV, D-II.
Step 3: Final Answer:
The correctly matched sequence corresponds to option (D).
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