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Magnetic Domain Theory:

How matter becomes magnetized

Can a magnet be broken into pieces?

  • two new magnets (or more!)
  • each new magnet will have 2 new poles
  • every magnet consists of tiny magnets lined up end to end or pole to pole
  • where the magnet breaks, it will simply separate between two poles
  • the DOMAINS in the magnet allow this to happen

Well, what is a Domain ?

A magnetic domain is region in which the magnetic fields of atoms are grouped together and aligned. You can think of magnetic domains as miniature magnets within a material. In an unmagnetized object all the magnetic domains are pointing in different directions. But, when metal becomes magnetized, which is what happens when it is rubbed with a strong magnet, all like magnetic poles line up and point in the same direction. ndt -edt.org

Now we need to go back and review

a picture of the atom

electron orbits and rotations

  • the electrons orbit the nucleus
  • they spin on their own axis while orbitting around the nucleus, much like the earth rotating around the sun

The spinning nature of the electrons

induces a mini magnetic field, and the cause is still...

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