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What kind of a ferromagnetic material is...

What kind of a ferromagnetic material is used for coating magnetic tapes in a cassette player or for building 'memory stores' in a modern computer?

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Ceramics (specially treated barium iron oxides) also called ferrites are used commonly for coating magnetic tapes in cassette players or building memory stores in modern computers. Some commonly used ferrites are `MnFe_2O_4, NiFe_2O_4` etc.
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Answer the following question: (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 ferromagnet is a device for strong memory? Explain the meaning of this statement. (d) What kind of ferromagnet 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.

A: Ceramics (specially treated barium iron oxides) also called ferrites are used for coating magnetic tapes in a cassette player, or for building memory stores' in a modern computer. R: A certain region of space surrounded by soft iron rings is approximately shielded from magnetic fields.

What happens in domain of ferromagnetic material is placed in external magnetic field

The relative permeability of a ferromagnetic material is 500 what is its magnetic susceptibility

Answer the following questions: (a) Why does a paramagnetic sample display greater magnetization (for the same magnetizing field) when cooled. (b) Why is diamagnetism, in contrast, almost independent of temperature? (c) If a toroid uses bismuth for its core, will the field in the core be (slightly) greater or (slightly) less than when the core is empty? (d) Is the permeability of a ferromagnetic material independent of the magnetic field? If not, is it more for lower or higher fields? (e) Magnetic field lines are always nearly normal to the surface of a ferromagnet at every point (This fact is analogous to the static electric field lines being normal to the surface of a conductor at every point). Why? (f) Would the maximum possible magnetization of a paramagnetic sample be of the same order of magnitude as the magnetization of a ferromagnet?

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MODERN PUBLICATION-MAGNETISM AND MATTER-NCERT FILE (ADDITIONAL EXERCISE)
  1. Why is diamagnetism, in contrast, almost independent of temperature?

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  2. If a toroid uses bismuth for its core, will the field in the core be (...

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  3. Is the permeability of a ferromagnetic material independent of the mag...

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  4. Magnetic field lines are always nearly normal to the surface of a ferr...

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  5. Would the maximum possible magnetization of a paramagnetic sample be o...

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  6. Explain qualitatively on the basis of a domain picture the irreversibi...

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  7. The hysteresis loop of a soft iron piece has a much smaller area than ...

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  8. A system displaying a hysterisis loop such as a ferromagnet, is a devi...

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  9. What kind of a ferromagnetic material is used for coating magnetic tap...

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  10. A certain region of space is to be shielded from magnetic fields. Sugg...

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  11. A long straight horizontal cable carries a current of 2.5amp. In the d...

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  12. A telephone cable at a place has four long straight horizontal wires c...

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  13. A compass needle free to turn in a horizontal plane is placed at the c...

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  14. A magnetic dipole is under the influence of two magnetic fields. The a...

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  15. A monoenergetic (18 keV) electron beam initially in the horizontal dir...

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  16. A sample of a paramagnetic salt contains 2.0 xx 10^(24) atomic dipoles...

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  17. A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ...

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  18. The magnetic moment vectors vecmus and vecmul associated with the intr...

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