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Which of the following exhibits spontaneous magnetisation?

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Which of the following exhibits spontaneous magnetisation?

(a) Paramagnetic material

(b) Ferrimagnetic material

(c) Diamagnetic material

(d) Ferromagnetic material

This question was posed to me in an interview.

This intriguing question originated from Theory of Ferromagnetism topic in portion Magnetic Properties of Materials of Engineering Physics II

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Correct option is (d) Ferromagnetic material

Easiest explanation: The ferromagnetic materials exhibit magnetisation even in the absence of an external field. This property is called spontaneous magnetisation. Hence ferromagnets exhibit spontaneous magnetisation.

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