what magnet is easily lose their magnatism?
104827
An electromagnet , it is temporary magnet.without the electrocity, it is not a magnet.
3282
Neodymium magnets are the most powerful magnets in the world.
1097908
Iron, cobalt and nickel can be magnetic. They can be made to have polarity. Poles that are alike repel and poles which are not alike attract. A magnet will attract all of them if they are not polarized. If they are polarized, a magnet will attract or repel according to the polarity.\n;-D
1136539
Paramagnetic materials like Aluminum have magnetic properties, but cannot sustain a permanent dipole moment alignment. Hence it qualifies as a candidate for your question.\n\nAlso ferromagnetic materials (common ones are Cobalt, Iron, and Nickel) above their associated curie temperatures behave the same way. No permanent magnetization.
199857
A large magnet will do the trick.
1013566
For common metals, iron is pretty much all you have.  Magnetite is an oxide of iron that is the about the most magnetic metal on earth.\n If you are looking for low weight, rare earth magnets are the way to go, but will cost you accordingly.  Neodymium or Samarium-Cobalt are your best bets there.
1029513
has to be metal, preferably in several sheets not touching each other. Wood and plastic do not stop magnetic field.\n\nThick piece of lead would definitely work, and is completely safe (as long as you do not drop it on your foot and wash your hands afterwards)
114658
Get a magnet and try it.\n\nRead the last sentence of the link below:
1180717
It truly depends on the amount of Iron in the magnet as to the strength and the base material that it is made of.  Some of those cheap rubbery refrigerator magnets will deteriorate or dry rot over a period of years and thus lose it's quality.  \n\nHow ever a good solid high iron ore magnet will easily out live you.  (with proper care)
502196
No not at all, Rare arth Magnet is magnet made of Rare earth material classified under the lanthanide group. eg. Nd, Sm etc, and magnet made from this material are NdFeB- Neodymium Iron Boron, SmCo-Samarium Cobalt. These magnets have high energy. they react with aluminum on the basis of Eddy Current Principle, under magentized condition, But at the chemical level they don't react with aluminium
883128
Use a magnet. Iron is attracted to it, lead is not.
512643
ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. \nExposure to an opposing magnetic field will "knock it down", but not demagnetize it completely.
907372
A magnet whose magnetic properties is dependent on current flow.
975911
First of all, I'm not professional of physical. I don't know at all, but Iron and steel are really high permeability, and strongly attract to magnet. Seem like the steel bar would tell you which one rely force electron. I don't think Iron has any thing to do with steel.
1072982
a)It is already a magnet. It can not become an electromagnet.\nb)Can not happen\nc)If this happens it will only be for a short period\nd)After a long time its power may be reduced but not lost completely\n\nSo I can not tell for sure. Mots likely c
418317
http://en.wikipedia.org/wiki/Magnetism
317921
magnetic materal. \n\nMagnets that you see every day, like the kind people use on refrigerators, are usually made of iron