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Can I store a neodymium magnet in a freezer?

  1. Dec 20, 2013 #1
    Well, permanent magnets are made of ferromagnetic material. These magnets lose permanent magnetization above the Curie temperature(on heating) and behave as paramagnetic materials. The reason is thermal energy. The magnetic moments lose their initial configuration and no longer remain aligned with each other. This reduces it's overall strength.

    Can I place my magnets in a freezer to ensure no loss in magnetization?
     
  2. jcsd
  3. Dec 20, 2013 #2

    SteamKing

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    It's not clear why you are concerned about loss of magnetization. The Curie Point, the temperature at which magnetization of a substance is lost, is well over 900 C for Nd magnets and 1000 C for iron magnets. As long as you aren't wandering around on the surface of Venus or Mercury, your magnets should be good to go at room temp.
     
  4. Dec 20, 2013 #3
    Nd magnets in freezer

    Yes, you can store them in a freezer. This will be no different from storing them at room temperature with respect to their losing their magnetic strength over time.

    Nd:Fe:B magnets have different Curie temperatures depending on their specific formulation. The ones with the highest field strength tend to have lower Curie temperatures. If you're building systems that incorporate rare earth magnets (at least the Nd based magnets I'm familiar with), you should ensure they don't get above 100°C for short periods (think a few minutes). A good engineering design rule is to limit them to 80°C.

    Storing them in a freezer, or anywhere below normal ambient temperature, will have no benefit and probably isn't worth the effort.
     
  5. Dec 21, 2013 #4

    Baluncore

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    Magnets that are brittle may shatter when subjected to rapid temperature changes.
     
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