Discussion
The steps of a magnetisation curve, taken from the unmagnetised state, are listed below. Put them in order.
1. Rotation of the magnetisation within domains 2. Reversible bending of domain walls 3. Approach to saturation 4. Irreversible domain wall motion
Answer: A
The easiest process comes first: small reversible bowing of the walls, then the irreversible jumps that give the steep part of the curve, then rotation against the crystal anisotropy, and finally the slow approach to saturation.
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