Question:
Answer the following questions: (a) Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet. (b) The hysteresis loop of a soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation, which piece will dissipate greater heat energy? (c) A system displaying a hysteresis loop such as a ferromagnet, is a device for storing memory? Explain the meaning of this statement. (d) What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player, or for building memory stores in a modern computer? (e) A certain region of space is to be shielded from magnetic fields. Suggest a method.
Answer:
(a) This is because the domains are not completely randomized when the external driving field is removed.
(b) Carbon steel piece
(c) The magnetization of a material is a record of its cycle of magnetization. As the information can be made to correspond to these hyteresis loops information can be stored.
(d) Ferrites (e) Surround the region by soft iron rings. But this is not perfect as electrostatic shielding obtained in hollow conductor.
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