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Welcome Back Minions. Warm Up Is On The Board. Warm Up Questions. How can an atom behave like a magnet? How are Magnetic Domains arranged in a magnetic material? How can magnets be changed?. Atomic Flashback. An atom contains neutrons and positively

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Welcome Back Minions

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Welcome Back Minions

Warm Up Is On The Board


Warm Up Questions

  • How can an atom behave like a magnet?

  • How are Magnetic Domains arranged in a magnetic material?

  • How can magnets be changed?


Atomic Flashback

An atom contains neutrons and positively

charged protons in its nucleus. Negatively

charged electrons move randomly throughout

an atom.


Electron Spin

  • Electron Spin

    • A spinning electron produces a magnetic field that makes the electron behave like a tiny magnet in an atom.

    • In an atom, most electrons tend to form pairs where each spin in opposite directions of each other, cancelling out the magnetic charge.

    • BUT!!! Some atoms contain electrons that are not paired. These atoms tend to have strong magnetic properties!


Magnetic Domains

  • Most material have their magnetic fields point in random directions. This cancel each other out entirely.


Magnetic Domains

In a magnetized material, all or most of the magnet domains are arranged in the same direction.


Magnetic Domains

Modern magnets come in a variety of shapes and are made from many different materials.


Magnetic Materials

  • Ferromagnetic Material

    • A material that shows strong magnetic properties.

  • Tend to be made of alloys.

    • Example: Alnico (Aluminum, Nickel, Iron, Cobalt)

    • Most magnets made from Ferrite

      • Mixture of substances that contain ferromagnetic elements.

      • Stronger & less expensive that metal magnets.


World’s Strongest Magnet

  • National High Magnetic Field Laboratory

    • Florida State University

    • 500,000 times stronger than Earth’s Magnetic Field

    • Custom built split magnet

      http://www.youtube.com/watch?v=QGytW_C6hR8


Making a Magnet

  • The easier it is to make an object magnetized, the quicker the object loses its magnetism.

    • Temporary Magnet

  • The harder it is to magnetize an object, the longer the object stays magnetized!

    • Permanent Magnet


Make a Magnet


Destroy a Magnet

  • A couple of ways…

    • Strike the magnet.

      • Knocks the domain out of alignment

    • Heating the magnet.

      • Heat = more random movement.

      • Makes it difficult to keep domains aligned!


Breaking a Magnet

Each piece of a magnet retains its magnetic properties after it is cut in half.


Wrap-up

  • How can an atom behave like a magnet?

  • How are Magnetic Domains arranged in a magnetic material?

  • How can magnets be changed?


Ticket out the door…

  • 1st Column

    • What does it take to make a magnet?

  • 2nd Column

    • What does it take to destroy a magnet?

  • 3rd Column

    • What happens when you break a magnet?


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