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Inside A Magnet
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Inside A Magnet

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Transcript

  • 1. Inside a Magnet
  • 2. Domain Theory
    • Atoms point in random directions in most materials therefore canceling out each others magnetic fields
    • If magnetic fields in a group of atoms are aligned with one another they create a magnetic domain.
  • 3. Alignment of Domains
    • When many or all domains are pointing the same direction, the material becomes magnetized.
  • 4. Magnetic Materials
    • Ferromagnetic Materials- materials that show strong magnetic properties (its magnetic domains are aligned)
      • Examples in nature: iron, nickel, cobalt, and gadolinium
  • 5.
    • Alloy magnets- made from several different materials
      • Alnico ( Al uminum, ni ckel, i ron, co balt)
    • Ferrite magnets- mixture of substances that contain ferromagnetic elements
      • Stronger and less expensive than
      • metal magnets
  • 6. Making and Changing Magnets
    • 2 ways to make magnets
      • Place unmagnetized ferromagnetic material in the presence of a strong magnetic field
      • Rubbing ferromagnetic materials with one pole of a magnet
  • 7.
    • Temporary magnet-
      • easy to magnetize, but easily loses its magnetism
    • Permanent magnet-
      • hard to magnetize, but keeps its magnetism for a long period of time
  • 8. 2 Ways to destroy a magnet
    • Drop or strike a magnet hard
    • Heat a magnet
  • 9. Breaking Magnets
  • 10. Breaking magnets
    • When you break a magnet, you end up with two smaller magnets
      • Due to domains all being aligned, the more times you break a magnet, the more mini magnets you end up with.