Magnetic Neodymium Magnets (NEO Rare Earth Magnets)

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NEODYMIUM MAGNETS

Neodymium Magnets are most commonly used in magnetic jewelry, bracelets, and Neodymium Magnet disks are individually used as spot magnets on pain trigger points or acupuncture points.

Material Gauss Rating: A typical neodymium magnet used as above will measure 1000-3500 gauss on the surface depending on its size.

Neoymium Magnet, Rare Earth Magnets, Information

A neodymium magnet or NIB magnet (also called a rare-earth magnet) is a magnet made of a combination of neodymium, iron, and boron — Nd2Fe14B. Due to their strength to mass ratio and there lower manufacturing cost, neodymium magnets have replaced marginally weaker samarium-cobalt magnets in many applications. Neodymium magnets are very strong in comparison to their mass, but are also more fragile and may lose their magnetism at temperatures above 80 degrees Celsius (well above normal human conditions). High-temperature grades will operate at up to 200 and even 230 °C but their strength is only marginally greater than that of samarium-cobalt.

Neodymium magnets (or “neo” as they are known) have strength grades from a low of N24 to the current high of N54. The N represents the type of magnet "neodymium", while the number after the N represents the magnetic energy product, in megagauss-oersteds (MGOe) (1 MG·Oe = 7,958 T·A/m = 7,958 J/m³). Thus, N48 has a remnant static magnetic field of 1.38 teslas and an H (magnetic field intensity) of 13,000 oersteds (1.0 MA/m). What does this mean? A neodymium magnet of N48 strength will be 18 times smaller than a ceramic magnet with the equivalent magnetic strength. The neodymium magnet industry is attempting to increase the maximum energy produced (strength) of a neodymium magnet closer to the theoretical maximum of 64 MGOe while also working to improve the maximum operating temperature for any given strength.

Neodymium magnets can lift 1300 times their own mass and in addition to industrial uses are used for the most effective magnetic therapy in magnetic jewelry, magnetic bracelets, and spot magnet treatments. Very small neodymium magnets can have amazing properties. A somewhat larger magnet interacts strongly enough with the magnetic field of the Earth to allow its tendency to align with that field to be perceived directly when holding it, essentially forming a compass. Cylinder- and disc-shaped neodymium magnets are especially responsive to the Earth's magnetic fields. Neodymium magnets are often considered in magnetic therapy due to their magnetic alignment properties.

Caution
Caution must be taken when using neodymium magnets. Some that are slightly larger than the size of a penny are powerful enough to lift over 10 kilograms. They may interfere with pacemakers and implanted heart devices. Close contact with a small neodymium magnet may destroy the contents of a floppy disk or on the magnetic stripes of credit cards. Neodymium magnets are often strong enough to not only magnetize color CRT shadow masks, but also physically deform the mask itself. Such damage is typically not repairable by degaussing. If swallowed, neodymium magnets can cause lethal conditions by joining up inside the intestine.

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