Is it possible to make the magnets lose it magnetic field permanently?

I know magnets can lose its magnetic properties if exposed to heat, but is there a way to make the magnets permanently lose its magnetic fields?

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Supercoke8 years ago
I heard that prolonged exposure to heat can move the ions around making it loose its magnetic field. repetitive shock (as in hitting it with a hammer) also has this effect. Usually old magnets tent to have lost magnetism because of all hitting and banging that they are used under. Bigger magnets loose their strength faster because they tend to slam onto the metal or other magnets faster and with more force. Usually when buying strong magnets they give you some less powerful magnets known as "keepers" these are put there to regulate the flow of ions in the magnet if put in the right position, thus keeping the magnet from loosing it's strength during transport and keeping it's "shelf life". It is wise to keep this "keeper" so that your magnet stays in better condition when you are not using it.
cheeswiz5 years ago
the best way to remove the magnetic field is probably to use the AC current method or near melting point method.

However, More Importantly once this is done heating them up to near melting point and applying a magnetic field to them while heated will Reinitialize them and probably make old magnets much stronger to near original strength.
bakermiro6 years ago
if it warms up they will lose their ability to attract iron, steel and nickel

eyerobot7 years ago
magnets are creating by one method of cooling down while they are hammered repeatedly within a strong electromagnetic field. But they can be demagnetized by bringing them up to their curie point (The temperature that they demagnetize completely), And after that they have no magnetism to speak of.
over a long time i had the same thing
Rotten1948 years ago
3 ways: -Pound it really hard with a hammer. Like REALLY hard. -Run high voltage through it -Subject it to high heat.\ They all work by messing up the domains of the magnet.
stick it in the toaster for a little bit. or oven.
if you drop them from a good height say 6 to 7 feet on concrete, they will lose their magnetism. I don't know how long it will be gone.
how dose that work
the shock will distort the domains in odd directions and make the magnetism go away. If you run a magnet in the same line in the same direction on a piece of iron it will align the domains and make it a magnet. its complicated.
thats cool lol I didn't know that. I knew you could make a piece of iron into a magnet but not that droping said magnet will mess it up
A piece of iron is essentially a magnet :]
Yes, they can be completely de-magnetized by exposing to an electromagnet powered by alternating current.
Plasmana (author)  GuitarMan20558 years ago
Okay, I will give that a try...
For this to work, the applied field needs to be above the magnet's coercivity. For some magnets (notably supermagnets), you probably won't be able to achieve this without special equipment, other magnets are easier.
danlab8 years ago
If you get them hot enough, the magnets will no longer be magnets
danlab danlab8 years ago
(it doesn't have to be that hot, a soldering held to a small magnet for a few seconds should usually demagnetize it)
The Jamalam8 years ago
I think if you hit them on a desk, their fields would go all skewy, but if you put a magnet near to it, the electrons, all having a magnetic field of their own but being caancelled out by each other, will all lign up again. It is hard. You could try reacting something with the magnetic material, making a non magnetic alloy.
Sarah868 years ago
Why wasting good magnet. Place them somewhere stacked together (this will add strengh over time) until you find a good use for them.
Plasmana (author)  Sarah868 years ago
I am not wasting any magnets, it is just an odd question that came up in my mind.
WHY YOU LITTLE*punches your mind for asking too many questions that don't make scene and just make some people go insane like this*
ReCreate8 years ago
Of course,heat it to extreme heat,much higher than any lighter maybe a few blow torches Just above melting temperature. You should be good to go.
hg3418 years ago
yes all magnetic will in some time lose the magnetic field(it takes 400 years give or take) as how to speed up time in a controlled manner and space(reliteve to the magnet as to not kill yourself by ageing) i dont think i can help you there
awang88 years ago
Yes, if you spin it at 5 000 000 000+rpm(I don't think that's possible), heat it up to the extreme or expose it to EXTREME force (like 1 billion + tonnes crushing power.).
joinaqd8 years ago
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PKM8 years ago
Yes- hammering, heating to a sufficient temperature or degaussing can all make a permanent magnet lose its magnetism. It might still retain a weak magnetism, but it will be much less than the original strength.
Short answer:
  • Black ceramic magnets will remain useful for decades, as long as you don't force them against a neodymium magnet.
  • Neodymium magnets will remain almost unchanged for decades, as long as you don't use them at temperatures over 176F.
There are a couple terms you need to know about magnets to research this question. Roughly speaking,
  • remanence tells you how much magnetism the material can retain, while
  • coercivity tells you how hard it is to demagnetize.
A few common types of magnets:
  • Ceramic are weakly magnetic but difficult to demagnetize (and very cheap)
  • AlNiCo have moderate magnetic strength but are easy to demagnetize
  • NdFeB have both great magnetic strength and are difficult to demagnetize
  • SmCo have great magnetic strength, are difficult to demagnetize, and work at high temperatures (but are terribly expensive)
You can demagnetize a magnet by:
  • chemically altering it (such as letting it rust) into something with low remanence
  • applying an external field that overcomes its coercivity (forcing it against a much bigger magnet)
  • mixing up its magnetic domains (such as by mechnical shock)
  • heating the material above its Curie point or by a smaller amout of heating while applying an external field
vince 098 years ago
if you heat it up really hot it will loose magnetism
NachoMahma8 years ago
That's pretty much it - for the most part magnets are magnetic because their molecules and thus charges are all lined up in straight columns, rather than random. (Hence why electromagnets magnetize with current wrapped around them - the charges align in the presence of the electric field). To remove a magnetic field, you have to reorient the molecules. Heat is great at this, it wrecks everything ;). Magnets are also sensitive to high impact, and the relative motion of other magnetic fields can weaken them.