The strongest permanent magnets in the world are neodymium Nd magnets, they are made from magnetic material made from an alloy of neodymium, iron and boron to form the Nd 2 Fe 14 B structure. Neodymium magnets are considered part of the family of rare earth magnets because their main element is the rare earth element, neodymium. Samarium cobalt is the other type of rare earth magnet; samarium cobalt SmCo magnets were developed before neodymium magnets and while not as strong as neodymium magnets they have a greater resistance to corrosion and can operate and maintain their performance at higher temperatures.
To increase the performance of both neodymium and samarium cobalt magnets traces of additional rare earth elements such as dysprosium Dy and praseodymium Pr are added. Since they were first introduced, stronger grades of neodymium magnets have become commercially available as manufacturing techniques have become more advanced.
As long as the magnetic field is on, this turning continues, causing the electric charge to travel in spirals. Once traveling in spirals, an electric charge acts like a small, oriented, permanent magnet and is therefore repelled from regions of high magnetic field gradient.
Therefore, electric charges tend to spiral around magnetic field lines and be pushed away from regions where magnetic field lines bunch up. These two effects cause electric charges to get trapped along magnetic field lines that are strong enough. Examples of this effect include ions trapped in earth's ionosphere, radiation trapped in earth's radiation belts, hot plasma looping over the sun's surface in solar prominences, and plasmas contained in the laboratory using magnetic traps.
The stronger the magnetic field gets, the more violently an electric charge is pushed sideways by the magnetic field, the faster and tighter it therefore spirals around in circles, and the stronger it gets pushed away from regions of high magnetic field gradient.
Interestingly, all normal objects are made out of atoms, and all atoms are made out of electric charges: electrons and protons. Therefore, strong enough magnetic fields have the ability to deform and even break objects.
When a magnetic field gets stronger than about , Gauss, objects get ripped to pieces by the intense forces. It depends on the application. If you need the highest strength in the smallest possible package at room temperature, grade N52 is the strongest available. Many of our magnets are offered in grade N42, which is a great balance between cost, strength and performance at higher operating temperatures.
You can get the same strength as an N52 magnet by using a slightly larger N42 magnet. This is especially true if your magnet shape is very thin. See our detailed article on Temperature and Neodymium Magnets for more details. For a complete list of available grades, see our Specs page. A magnet doesn't have one specific amount of Gauss in it.
Residual Flux Density , Br , is the magnetic induction remaining in a saturated magnetic material after the magnetizing field has been removed. Scroll down to the last section of this article for a more detailed explanation.
This number is a material property which is independent of the magnet shape. See our Specs page for more Br values for various neodymium magnet grades. The Surface Field is the strength of the magnetic field measured right at the surface of the magnet.
Neodymium magnets are by far the strongest type of permanent magnet available. Magnet advancements are a history of increasing coercivity. Neodymium magnets are both stronger and less apt to be demagnetized than other magnet types.
The Maximum Energy Product is the point on this curve where the B value multiplied by the H value is at its maximum. Magnets with a bigger Maximum Energy Product will have greater strength.
Specifically, the shape of the BH Curve indicates both how strong a magnet is and how strong of a magnetic field you would need to demagnetize the magnet. A BH Curve describes the magnetic properties of the magnetic material. Featured Video. Cite this Article Format. Helmenstine, Anne Marie, Ph. Strongest and Weakest Parts of a Magnet. Understanding the Earth's Two North Poles. What Is Magnetism? Definition, Examples, Facts.
The Compass and Other Magnetic Innovations. Measuring Plate Motion in Plate Tectonics. The Relationship Between Electricity and Magnetism. Dipole Definition in Chemistry and Physics. Your Privacy Rights.
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