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The greater forces exerted by rare-earth magnets create hazards that may not occur with other types of magnet. Neodymium magnets larger than a few cubic centimeters are strong enough to cause injuries to body parts pinched between two magnets, or a magnet and a ferrous metal surface, even causing broken bones. [46]
A neodymium magnet of a few tens of grams can lift a thousand times its own weight, and can snap together with enough force to break bones. These magnets are cheaper, lighter, and stronger than samarium–cobalt magnets. However, they are not superior in every aspect, as neodymium-based magnets lose their magnetism at lower temperatures [52 ...
A magnetic alloy is a combination of various metals from the periodic table such as ferrite that exhibits magnetic properties such as ferromagnetism. Typically the alloy contains one of the three main magnetic elements (which appear on the Bethe-Slater curve ): iron (Fe) , nickel (Ni) , or cobalt (Co) .
Magnetic induction B (also known as magnetic flux density) has the SI unit tesla [T or Wb/m 2]. [1] One tesla is equal to 10 4 gauss. Magnetic field drops off as the inverse cube of the distance ( 1 / distance 3 ) from a dipole source. Energy required to produce laboratory magnetic fields increases with the square of magnetic field. [2]
Much like the former Alnico 5 magnets, the Neo magnets with a higher percentage of neodymium will lose their magnetic field faster than ones with less Neodymium in the alloy. The drawback of decreasing Neodymium in the magnet is that it will result in heavier magnets, having less magnetic field.
The magnetic field (in green arrows) from the magnet's north pole passes down through the metal sheet. Since the metal is moving, the magnetic flux through a given area of the sheet is changing. In particular, the part of the sheet moving toward the edge of the magnet (the left side) experiences an increase in magnetic flux density >.