what are the three kinds of magnetic material?
110570
The most common magnetic metals are iron, nickel, and cobalt. Alloys (mixtures) that contain one or more of those elements are usually magnetic (i.e. will stick to magnets).
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Strong and patented super magnets usually do not or never wear out and do not lose their magnetic charge so permanent use for a long period is guaranteed. Hard chromium coated magnets are known to be good.\n\nThere are also kinds of magnets  like an ordinary ceramic magnets which lose their magnetic charge with time or when exposed to heat. Just be careful in choosing the kind of magnet  itself.♥
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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.
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it depends on the alloy of stainless steel (there are MANY different varieties of stainless steel) -- some stainless steels are "magnetizeable," others are not.\n\ncommon non-magnetic stainless steels include those found in automotive exhaust systems and those found in naval submarine hulls.\n\nif you're talking about the outside case of the refrigerator, it's usually made of a magnetic steel (hence "refrigerator magnets")\n\nif your fridge's steel is non-magnetic, the only way to magnetize it is to replace the non-magnetic steel with a magnetic variety.  as an intellectual exercise, this is theoretically possible; however, it is not economically practical.
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It's probably steel, since that offers a good combination of strength, light weight, and low price.  Have you tried a magnet on the metal parts of it?  \n\n If it's not steel, maybe it's stainless steel (which tends to be non-magnetic depending on the alloy) or aluminum, but those are quite a bit more expensive than regular sheet steel.
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Some types of metal and other magnets.
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A simple magnetorheological fluid can be home-made out of small magnetic particles mixed with mineral or vegetable oil. Iron filings do not work well; they are too big. Good sources for small magnetic particles are:\n\n    * magnetic inspection powder from welding shops\n    * particles from burned steel wool (after mortar and pestle)\n    * particles scraped from the surface of video tapes\n    * particles "mined" from sand with a plastic bag and a magnet (see external links)\n\nThese fluids are not very stable, however. The particles will tend to clump and the fluid properties will be lost quickly. Fluids created for professional purposes use emulsifiers to suspend very small oily (octane or kerosene) magnetic particles in water. The particles are very fine; less than a micrometre in diameter.
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Do you mean "magnetic"?????
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elements fall under one of three categories: stuff that is always attracted to a magnetic field, stuff that is always repelled by a magnetic field, and stuff that can be magnetized ei you can make a magnet out of it. For example, water (yes i know its not an element) is always repelled by a magnetic feild, titanium is always attracted and iron can be magnetized. To see the effects of water being repelled by a magnetic field, buy some neodymium magnets, (the bigget the better) and place it in a bowl of water so that the magnet is barely covered with water. place it in front of your compurer screen, and look at the reflection of the computer screen in the water just above the magnet. you will notice th reflection is warped just above the magnet.
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iron, stony, stony-iron,are the three basic types, though there are many other variations that are recognized such as carbonaceous chondrite
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iron ore (magnetite or lodestone), cobalt, and nickel, as well the rare earth metals gadolinium and dysprosium (when at a very low temperature). \n\nThat'll about do it... \n\n\nest is mein vergnugen.
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Most magnets are formed by moving electrons. Each moving electron creates a small magnetic field. If lots of electrons are moving along the same path, they create a bigger magnetic field. Because of this you can make a magnet by using electric current. If you wrap a coil of wire around a piece of iron (like a big nail) and then put electricity through it using a battery, you will create a magnetic field. This is what we call an "electromagnet." Remember, only use batteries if you try this, never use a wall outlet--this is much too dangerous!!
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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.
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There are four classes of modern commercialized magnets, each based on their material composition. Within each class is a family of grades with their own magnetic properties. These general classes are:\n\n 1.Neodymium Iron Boron\n    \n 2.Samarium Cobalt\n  \n 3. Ceramic, and \n  \n 4. Alnico
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Here is a great lab on ferrofluids that I am familiar with. Some info about ferrofluids is in there, too.\n\nhttp://mrsec.wisc.edu/Edetc/nanolab/ffexp/index.html
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Ferromags are substances that are strongly attracted by a magnetic substance. Some ferromagnetic  metals are iron, cobalt, nickel, gadolinium and dysprosium. To generate electricity from ferromags, take two iron sheets 5 cm wide. rub both of them using a bar magnet only in one direction for about 10 minutes. This will impart magnetic properties to d iron sheet. Then u arrange the sheets in such a way that u feel d force of attraction between the sheets. take a copper wire. make a loop out of it. rotate d loop in d space between d sheets with a constant frequency. Voila electricity generated at d ends of d loop
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learn more about different plastic materials