Rare Earth Magnets - Uses

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Rare earth magnets are made out of rare earth elements or alloys. These are not rare in the real sense of the term. These are made from elements that are from the "rare earth" group. These became widely popular during the 70's and 80's. Earth magnets are regarded to be much stronger than the other magnetizers that are made of ferrite and alnico. These are thus capable of being used for a longer duration of time. 

Earth magnets are widely popular as these are the preferred choice of many industries. Some of the most common applications of the same can be seen in computer bicycle dynamos, hard drives, audio speakers, and fishing reel brakes. Few other applications where this is used include diamagnetic levitation experiments, stop motion animations, wind turbines and roller coasters.
There are two categories of earth magnets - Samarium cobalt and Neodymium. The first one is the very first type of earth magnet that was developed. These cost more and are weaker in strength than the second type of magnet. This is why these have not been manufactured in large scale industries. It has a high curie temperature that ensures that its magnetic properties stay intact. It is used for manufacturing high speed motors and in different kinds of equipments. It also finds its use in the manufacture of some musical instruments. 
Neodymium magnet is also referred to as NdFeB, Neo and NIB. It is a permanent element that was discovered in the 80's. Made of an alloy of iron, neodymium and boron, it is a strong magnet. It has a very high magnetic field strength and has a number of uses. As these are cheaper it finds its use in many different industries. It is used in the manufacturing of synchronous, stepper and spindle motors. It is also used for making couplings and bearings. Resonance imaging is another area where it is used.
These are 1.5 to 3 times stronger than the usual refrigerator magnets. These are available in a range of shapes and sizes. There are cylinder shaped, disk shaped, ring shaped and many other shapes to choose from. If used properly these magnets would serve a lifetime. These are much more powerful than the other horseshoe magnets that can be found in the market. 
This is the most widely used rare earth magnet. Affordable and strong these do not lose their magnetism easily and can last for long. The magnets can be customized to suit individual needs. Customizing is easy and it is not at all costly to get the magnets personalized by the manufacturer.
Rare earth magnets are being increasingly used in children's toys as well. As these are much cheaper and less bulky, manufacturing companies prefer using these in children’s products.
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Rare Earth Magnets - Uses

This article was published on 2012/01/10