No matter what people say, magnets are the most amazing things on earth. They are small, attractive and fun to play with at all ages. They are curious little objects that are intriguingly useful beyond their playful nature. Magnets can be used for many purposes—from simple tasks such as holding notes on a refrigerator to powering speakers and microphones. Anyone who has ever used a magnet must have wished for even stronger magnets. This is where rare earth magnets come in. They are strong permanent magnets made from alloys of rare earth elements.
Are rare earth magnets as “rare” as it sounds? The idea that they are composed of rare elements is actually misleading. They are made of elements belonging to the lanthanides series of the modern periodic table. This series is collectively called the rare earth elements, hence the name. Unlike their moniker, rare earth magnets are incredibly strong, having field strength about or exceeding 1.4 Tesla. This strength is a lot when compared to ceramic and ferrite magnets that have field strength of 0.5 to about 1 Tesla.
There are two types of rare earth magnets: neodymium and samarium-cobalt. The former contains neodymium, iron and boron, while samarium-cobalt magnets contain samarium and cobalt. Neodymium is the stronger of the two, though it is inferior to samarium-cobalt in its resistance to oxidation and Curie temperature. Samarium-cobalt magnets, invented earlier, are less used due to the higher cost associated with making them and weaker magnetic field strength. However, they have a higher Curie temperature, meaning they can be used in environments with high operating temperatures.
It was not until the early 1990s that rare earth magnets became mainstream. Before that, they were too costly to produce since raw materials and patent licenses were expensive. They are now used in a wide variety of applications, some of which include computer hard drives, audio speakers, bicycle dynamos and self-powered flashlights. They are also used in industrial applications such as linear motors, electrodynamic bearings, LED throwies, windbelts and more.
Rare earth magnets are widely available and can be purchased both online and in stores. You can use them in your engineering or do-it-yourself projects. They have also found much use in the health sector where neodymium magnets are used to reduce injury recovery time and inflammation. The magnetic fields produced by these magnets regulate blood circulation, among other things, resulting in better health.
As it stands, rare earth magnets are interesting on all fronts. They are stronger and better than their regular counterparts are, have many applications in both daily and industrial uses, and are useful when it comes to health. You can use them as part of your own projects as well.
Visit Rare Earth Magnets for more information or visit our blog at http://baxter-house.com/rare-earth-magnets-%E2%80%93-strong-and-better/.