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SpinDistribute.com Article Directory

The following article was published in our article directory on June 30, 2014.
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What Are Rare Earth Magnets?

Article Category: Arts and Crafts

Author Name: Nick Bugeja

Rare earth magnets were developed in the 1970s and 80s, and are durable permanent magnets that are made out of rare earth elements and alloys. These magnets are the toughest type of permanent magnets that exists. It produces considerably stronger magnetic fields compared to other types of magnets out there. They make magnetic fields over 1.4 teslas. Other magnets, such as ceramic or ferrite magnets, produce only around 0.5 to 1 tesla.

Like iron, rare earth magnets can be permanently magnetized due to their ferromagnetic elements, but their magnetism only shows in low temperatures. This is due to the fact that their Curie temperatures, or the temperature that a material's permanent magnetism changes to induced magnetism, are below room temperature. The edge of the rare earth magnets is that a crystal of its material can be easily magnetized in a specific direction. The magnets can take on different forms: blocks, discs, rings, rods, spheres, and holding pots. This versatility allows the magnets to be used in different applications.

The typical properties of permanent magnets are coercivity, remanence, energy product, and Curie temperature. Rare earth magnets have a significantly higher coercivity, higher remanence, higher energy product, and lower Curie temperature compared to other types of magnets.

There are basically two kinds of rare earth magnets; these are neodymium and samarium-cobalt. The former is the toughest and cheapest type of the rare earth magnets. They are composed of boron, iron, and neodymium. Their magnetic field strength is the highest and they boast a higher coercivity. However, neodymium magnets have a low Curie temperature and are more susceptible to samarium-cobalt magnets and oxidation. Samarium-cobalt magnets, on the other hand, are the first group of rare earth magnets invented, but are used less frequently compared to neodymium magnets. The reason for this is their magnetic field strength, which is weaker, and their higher costs. The advantage of samarium-cobalt magnets, though, is their high Curie temperature, placing them in a position to be used in cases where a high field strength is required.

Like any other magnet, these magnets can also pose potential hazards when not properly used. Their strength can cause injuries to body parts placed between two magnets, or a magnet and a surface. This is especially true for magnets that are of considerably larger size. Two magnets that are permitted to get too close with each other can pull one themselves to each other and collide, breaking it and can potentially send fragments flying.

There have been plenty of uses found for magnets, including audio speakers, computer hard drives, fishing reel brakes, wind turbine generators, bicycle dynamos, traction motors, linear motors, and neodymium magnetic toys, among many others. Neodymium magnets are usually used because of their lower cost and greater strength. They are multiple times stronger, provide higher energy, and have maximum efficiency. They are frequently used in medical, electronics, and engineering fields.

Keywords: rare earth magnets, neodymium magnets, disc magnets, n52 magnets

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