Storage solutions depend on the nature of the articles being stored. Magnets have special characteristics, requiring careful storage. Be aware also that different magnets display different sensitivities. Know the material used in the construction of your permanent magnet. The four things you should be aware of are: heat, shock, moisture and demagnetization.
To store a bar magnet you should store it at room temperature . You should prevent it from mechanical shock, as well as keeping them in a dry place. Put away each type of magnet in its own space or drawer to prevent demagnetization and use a magnet keeper to preserve the magnetic charge.
The best way to store barmagnetsis in pairs, with thenorth poleof one magnet up against the south pole of the next magnet. With many magnets, you can stack them together like this:
SNSNSNSNSNSNSN||||||||||||||||||||||||||||NSNSNSNSNSNSNS
It will be hard to take them apart, but they will help each other to keep charge. If you look at the direction offield linesaround a bar magnet (I couldn't find a good picture on the web, but you might have a book with a good picture), you will see that outside of the magnet the field lines are in the opposite direction from the field inside the magnet. So if you want two magnets towork
together, you have to line them up oppositely. This is also why bar magnets are attracted to each other when lined up oppositely, but repeled when lined up the same way.
If you just throw them into a box any which way, then the magnets will slowly lose their fields. Also, if you drop them, throw them around or otherwise knock them the magnets will lose charge.
Store the magnet at room temperature. Storing it at a temperature greater than its Curie temperature will demagnetize it. The Curie temperature--named after the French scientist Pierre Curie--is the temperature at which magnets lose their permanent magnetism. This temperature varies, based on the magnetic material. Here are the Curie temperatures for the four most common types ofpermanent magnets: ceramic/ferrite magnets--460C,alnico magnets(alloy of aluminum, nickel, and cobalt)--860C,samarium cobalt magnets(alloy of samarium and cobalt)--750C, and neodymium magnet (alloy of neodymium, iron, and boron)--310C.
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Take care to protect the magnet against mechanical shock. Samarium cobalt, neodymium, and ceramic/ferrite magnets are brittle. They will crack or break if they fall on a hard surface or bang against metal or another magnet. Do not strike them with a hammer. Alnico magnets are the strongest of the four types. They will not crack or break with any mechanical shock.
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Keep the magnets in a dry place. The most likely to suffer moisture degradation is the neodymium magnet. The other three types of magnets are not prone to rust or corrosion.
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Put away each type of magnet in its own space or drawer to prevent demagnetization. The common alnico magnet is the most easily demagnetized. Use a magnet keeper to preserve the magnetic charge. You can storehorseshoe magnetsend-to-end, with opposite poles touching. Store bar magnets so that the opposite poles are beside each other--the north pole of one magnet should be next to the south pole of the other. The other three types of magnets do not demagnetize easily.
