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These materials are the only ones that can retain magnetization and become magnets; a common example is a traditional refrigerator magnet. Ferrimagnetic materials, which include ferrites and the longest used and naturally occurring magnetic materials magnetite and lodestone, are similar to but weaker than
Globally, most REEs are used for catalysts and magnets. [130] In the US, more than half of REEs are used for catalysts; ceramics, glass, and polishing are also main uses. [131] Other important uses of rare-earth elements are applicable to the production of high-performance magnets, alloys, glasses, and electronics.
Overhead magnets, magnetic pulleys, and the magnetic drums were the methods used in the recycling industry. [1] Magnetic separation is also useful in mining iron as it is attracted to a magnet. [3] Another application, not widely known but very important, is to use magnets in process industries to remove metal contaminants from product streams. [1]
A very common source of magnetic field found in nature is a dipole, with a "South pole" and a "North pole", terms dating back to the use of magnets as compasses, interacting with the Earth's magnetic field to indicate North and South on the globe. Since opposite ends of magnets are attracted, the north pole of a magnet is attracted to the south ...
One use is in water purification: in high gradient magnetic separation, magnetite nanoparticles introduced into contaminated water will bind to the suspended particles (solids, bacteria, or plankton, for example) and settle to the bottom of the fluid, allowing the contaminants to be removed and the magnetite particles to be recycled and reused ...
Scratches and general wear are common causes of demagnetization, but prolonged exposure to magnets can also ruin a card’s magnetic strip. ... although most credit and debit cards utilize water ...
Magnetic field produced by a solenoid (coil of wire). This drawing shows a cross-section through the center of the coil. The crosses are wires in which current is moving into the page; the dots are wires in which current is moving up out of the page. A common tractive electromagnet is a uniformly wound solenoid and plunger.
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related to: list of common uses of magnets and water