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Magnetic strength, types and measurement

Neodymium 'Rare Earth' magnets.

    Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful permanent magnets in the world. They are also referred to as NdFeB magnets, or NIB, because they are composed mainly of Neodymium (Nd), Iron (Fe) and Boron (B). They are a relatively new invention, first manufactured in 1984 and have only recently become affordable for everyday use.

    Neodymium 'Rare Earth' Magnets have a high resistance to demagnetization, unlike most other types of magnets. They will not lose their magnetization around other magnets or if dropped. They will however, begin to lose strength if they are heated above their maximum operating temperature, which is 176F (80C)

    If you've never handled neodymium magnets before, you will be amazed at their strength. Neodymium magnets are over 10 x stronger than the strongest ceramic magnets. If you are currently using ceramic magnets in your project, you could probably use a much smaller neodymium magnet and have greater force.

    Neodymium magnets also have some limitations due to their corrosion behaviour. In humid applications, a protective coating is highly recommended. Coatings which have been used successfully include E-coat (a liquid dip epoxy coating), dry electrostatic spray epoxy, nickel plating and combinations of these coatings. Changes in composition and processing over the past several years have resulted in significant improvements in corrosion resistance and high temperature performance.

    Just like ferrite magnets neodymium magnets come in the same wide array of shapes and sizes, but because of their greatly increased size it is possible to use a measurably smaller neodymium magnet and still have an equal or greater strength than that of a ferrite magnet. This is one of the main reasons why neodymium magnets are much more widely used for healing purposes than ferrite, as a much smaller and lighter weighing magnet can be used.

    Some common uses for neodymium magnets are:

Welding clamps
Oil filters
Toys
Knife/utensil holders
Jewellery clasps
Perpetual motion devices
MRI Scanners

    The positive benefits of neodymium magnets are:

They are the strongest magnets available approx 10 times stronger than ferrite magnets.
They are very lightweight.
They do not demagnetise very easily and can with stand temperatures up to 80 C.
They can be manufactured to a very small size e.g.2mm x 2mm and still have a strength of several thousand gauss.

    The main drawback of neodymium magnets is that they have a low resistance to corrosion. To prevent corrosion from water, they must be coated with plating or an epoxy resin.

    Neodymium magnets are used for all healing applications. They are the first choice due to their strength and size. They will also stay magnetised for at least 10 years, so they are a very economical choice for users. Most magnetic jewellery, straps, wraps and bedding will contain neodymium magnets.

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