Rare Earth Magnets: Properties And Perils
If you are in the market to buy rare earth magnets, it might be a good idea to take a refresher course on their properties, benefits, and disadvantages over other types of magnets. Ordering magnets online is easy if you know how they will be used and what properties to select. They come in all shapes and sizes with varying functions and special coatings. All you have to do is choose the one best suited to your needs.
Made from alloys of rare earth elements, rare earth magnets are strong, permanent magnets that create their own persistent magnetic fields. There are two types: 1) neodymium and 2) samarium-cobalt magnets. Samarium-cobalt magnets are more costly and have a weaker magnetic field that the neodymium magnets. Their advantage is that they are more resistant to oxidation and the Curie temperature (the temperature at which they lose their magnetism). Made of the alloy combination of neodymium, iron, and boron, neodymium magnets are stronger and more affordable, making them an effective replacement for Alnico and ferrite magnets. Many people have had the opportunity to buy rare earth magnets, since they are used in the production of computer hard drives, audio speakers and headphones, bicycle dynamos, fishing reel brakes, and permanent magnet motors in cordless tools like self-powered flashlights.
Rare earth magnets formed from alloys of rare earth elements (lanthanides) and transitional metals like iron, nickel, and cobalt are more stable because their Curie temperatures are far above room temperature. They have the advantage of high magnetic anisotropy, or direction dependence, which means that they magnetize in one direction but not in the opposite direction, retaining high magnetism as long as they are in a solid state. Their strength is further demonstrated by the resistance of the magnetic field to demagnetization and by the density of their magnetic energy.
The advantages of rare earth magnets are undeniable but their hazards are not well known. The fact is that any piece larger than a few centimeters can cause injuries to body parts caught between the magnet and a piece of metal. Magnets can attract one another with such a force that they chip one another, sending brittle material through the air that could injure eyes and soft tissue. In addition, if two magnets are swallowed, they can pinch a fold of intestine, causing distress and eventually leading to death. These magnets can also erase magnetic media like hard drives and credit cards that have even been known to magnetize CRT monitors at a significant distance.
Finally, before you buy rare earth magnets, remember that its pull force depends on many variables and environmental conditions. Surface conditions and the type of material being pulled against can change that force. The presence, or absence, of lateral and/or rotational forces, as well as plating composition can also lessen the pull strength.
Questions and Answers
Rare earth magnets are a special type of magnet, first manufactured in the 1970s. They are made from rare earth metals, which are a group of seventeen elements found in the periodic table. These include scandium and yttrium, and despite the name, they are actually found in relative abundance in the earth's crust. Rare earth magnets have the distinction of being the most powerful type of permanent magnet.
Rare earth magnets have their handy home uses as well. For do-it-yourselfers magnets help organize small items that can easily get lost, such as earrings, earring backs, paper clips, screws and nails. If a builder sticks a magnet in his or her pocket, that wrench, screwdriver or other small tool that is never where it needs to be is now helpfully hanging around the crafter's side quite literally.
Rare earth magnets are well known for producing magnetic fields that enhance health and healing. These fields produce negative ions that penetrate a person's body and bloodstream interacting with your body's natural metabolic functions to reduce pain. Consistent use of magnetic jewelry can sustain physical health long term, by bringing a healing touch to chronic aches and pains to help you feel better.
Many people buy rare earth magnets on a whim. The idea of having a very powerful magnet around induces feelings of excitement, especially for people who love science. Once the novelty of these magnets wears off, there are still many practical uses for them. Instead of leaving theme on a shelf to collect dust, consider using them as functional tools.
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These superior magnetic objects are traditionally called rare earth magnets, a terminology that by now has become a misnomer. The neodymium kind, for example, is widely available and mass produced in many countries of the world. Although the samarium-cobalt variety is far superior, it is not as readily available and hence more expensive to procure. The scientific explanation for the sheer magnetic force of both kinds is their electron charge, which can only be enhanced by their concave form.
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Ferro fluid is an interesting substance that is used for both practical and fun purposes. Aside from electronics and art, the substance is also a fun classroom tool that helps grade school children learn about magnets. In addition, with the flexibility of this substance, more practical applications for it are bound to be discovered in the future.
Ferrofluid is a stable liquid that contains miniscule magnetic pieces. Iron, magnetite, and cobalt are some of the most common metals. It is vital that these metals are small so they remain in the liquid form when exposed to a magnetic element.
Rare earth magnets are well known for producing magnetic fields that enhance health and healing. These fields produce negative ions that penetrate a person's body and bloodstream interacting with your body's natural metabolic functions to reduce pain. Consistent use of magnetic jewelry can sustain physical health long term, by bringing a healing touch to chronic aches and pains to help you feel better.
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