Keys to Know about Neodymium Magnets
A neodymium magnet, or a Neo magnet, is a special magnetic material that can smoothly lift an object heavier than itself. It can obviously attract common ferromagnetic materials like cobalt, iron, steel (an alloy of iron and selected metals) and nickel. When Neo magnets are magnetized, they become saturated with magnetic energy. This energy can be redirected using the ferromagnetic objects mentioned above. Additionally, to redirect the magnetic field of a Neo magnet, a ferromagnetic item must be employed for being highly permeable and efficient.
Another common misunderstanding among people is something with the poles of the magnet. For example, some think that monopole neodymium magnets can be found. The proved fact is that a complete magnet should have at least a North Pole and a South Pole. But it is possible to find a magnet with one pole at the inner side and the other pole at the outer side. A radically magnetized magnet is rare in nature regardless of its shape. To form a stronger neodymium magnet, one could stack two or more together. They will have combined strength and energy. The strength of a magnet is measured using a Gauss Meter. It measures the magnetic field density of magnetic materials at its surface (surface field) and the result is given in Gauss or Tesla. When one wants to know the pull force of magnets, use a special tester to measure the pull force in kilograms or pounds.
A customer may want to determine the pull force of certain NdFeB magnet to see if it is strong enough to lift the targeted objects. There are internet-based calculators that could be used to calculate the pull force. It is imperative to ensure that a calculator is not based on inaccurate theoretical formulas. A calculator that has been developed by expert engineers in the laboratory is the most appropriate. It is based on real cases or scenarios. For instance, in one case, a magnet could be squeezed in between two thick, ground and flat steel plates to determine its maximum pull force. In another case, optimal magnetic pull force can be computed on a neo magnet attracted to a similar one. An average value for the two or more samples is then derived.
This is a more practical way to determine the true pull force of a neodymium magnet. A good internet vendor will provide demagnetization curves (BH curves) for their grades of popular NIB magnet. Plain magnets without a coating are hard to find. This is because neodymium magnets consist of iron which corrodes easily on exposure to air or humidity. Unplated ones could only be provided as custom-made forms. Many internet sellers have magnets that have been coated with nickel, copper, gold and zinc. Nickel-copper-nickel plated rare-earth magnets are long-lasting. This is particularly if they are triple-plated options. And we can also add a paint coat on the top of nickel-plated surface. The best coating method is the spray-on paint and it is important to make the surface painted evenly for a smooth and pretty look.
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