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Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.
A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a bar magnet, the direction of the magnetic moment points from the magnet's south pole to its north pole, [ 15 ] and the magnitude relates to how strong and how far apart these poles ...
Due to ceramic ferrite magnet’s weaker magnetic fields compared to superconducting magnets, they are sometimes used in low-field or open MRI systems. [41] [42] These magnets are favored in certain cases due to their lower cost, stable magnetic field, and ability to function without the need for complex cooling systems. [43]
A Nickel-plated neodymium magnet on a bracket from a hard disk drive Nickel-plated neodymium magnet cubes Left: high-resolution transmission electron microscopy image of Nd 2 Fe 14 B; right: crystal structure with unit cell marked Inventor Masato Sagawa demonstrating a NdFeB magnet's force with 2 kg bottle.
Quadrupole magnets are useful as they create a magnetic field whose magnitude grows rapidly with the radial distance from its longitudinal axis. This is used in particle beam focusing. The simplest magnetic quadrupole is two identical bar magnets parallel to each other such that the north pole of one is next to the south of the other and vice ...
Avoid storing your credit card near magnets or other magnetic items. If your purse or wallet has a magnet on it, ensure the magnetic strip on your card faces away from the magnet to help avoid damage.
On May 24, 2024, the Biden Administration announced a 25 percent tariff on rare earth magnets from China, set to take effect in 2026. This marks the first time that critical minerals, including rare earth magnets, have been specifically included in the tariffs. [53] Following the tariffs MP Materials put out a statement listing the tariffs.
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